diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index f2a74ea647..891cc53765 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -141,6 +141,7 @@ module ActionView
       # will get expanded to
       #
       #   <%= text_field :person, :first_name %>
+      #
       # which results in an HTML <tt><input></tt> tag whose +name+ attribute is
       # <tt>person[first_name]</tt>. This means that when the form is submitted,
       # the value entered by the user will be available in the controller as
diff --git a/actionview/lib/action_view/helpers/javascript_helper.rb b/actionview/lib/action_view/helpers/javascript_helper.rb
index 629c447f3f..e237a32cb7 100644
--- a/actionview/lib/action_view/helpers/javascript_helper.rb
+++ b/actionview/lib/action_view/helpers/javascript_helper.rb
@@ -21,7 +21,7 @@ module ActionView
       # Also available through the alias j(). This is particularly helpful in JavaScript
       # responses, like:
       #
-      #   $('some_element').replaceWith('<%=j render 'some/element_template' %>');
+      #   $('some_element').replaceWith('<%= j render 'some/element_template' %>');
       def escape_javascript(javascript)
         if javascript
           result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|\342\200\251|[\n\r"'])/u) {|match| JS_ESCAPE_MAP[match] }
diff --git a/actionview/lib/action_view/renderer/partial_renderer.rb b/actionview/lib/action_view/renderer/partial_renderer.rb
index 56b8ab1e2d..cd151c0189 100644
--- a/actionview/lib/action_view/renderer/partial_renderer.rb
+++ b/actionview/lib/action_view/renderer/partial_renderer.rb
@@ -154,23 +154,23 @@ module ActionView
   # specified globally for the entire action, but they work in a similar fashion. Imagine a list with two types
   # of users:
   #
-  #   <%# app/views/users/index.html.erb &>
+  #   <%# app/views/users/index.html.erb %>
   #   Here's the administrator:
   #   <%= render partial: "user", layout: "administrator", locals: { user: administrator } %>
   #
   #   Here's the editor:
   #   <%= render partial: "user", layout: "editor", locals: { user: editor } %>
   #
-  #   <%# app/views/users/_user.html.erb &>
+  #   <%# app/views/users/_user.html.erb %>
   #   Name: <%= user.name %>
   #
-  #   <%# app/views/users/_administrator.html.erb &>
+  #   <%# app/views/users/_administrator.html.erb %>
   #   <div id="administrator">
   #     Budget: $<%= user.budget %>
   #     <%= yield %>
   #   </div>
   #
-  #   <%# app/views/users/_editor.html.erb &>
+  #   <%# app/views/users/_editor.html.erb %>
   #   <div id="editor">
   #     Deadline: <%= user.deadline %>
   #     <%= yield %>
@@ -233,7 +233,7 @@ module ActionView
   #
   # You can also apply a layout to a block within any template:
   #
-  #   <%# app/views/users/_chief.html.erb &>
+  #   <%# app/views/users/_chief.html.erb %>
   #   <%= render(layout: "administrator", locals: { user: chief }) do %>
   #     Title: <%= chief.title %>
   #   <% end %>
@@ -250,13 +250,13 @@ module ActionView
   # If you pass arguments to "yield" then this will be passed to the block. One way to use this is to pass
   # an array to layout and treat it as an enumerable.
   #
-  #   <%# app/views/users/_user.html.erb &>
+  #   <%# app/views/users/_user.html.erb %>
   #   <div class="user">
   #     Budget: $<%= user.budget %>
   #     <%= yield user %>
   #   </div>
   #
-  #   <%# app/views/users/index.html.erb &>
+  #   <%# app/views/users/index.html.erb %>
   #   <%= render layout: @users do |user| %>
   #     Title: <%= user.title %>
   #   <% end %>
@@ -265,14 +265,14 @@ module ActionView
   #
   # You can also yield multiple times in one layout and use block arguments to differentiate the sections.
   #
-  #   <%# app/views/users/_user.html.erb &>
+  #   <%# app/views/users/_user.html.erb %>
   #   <div class="user">
   #     <%= yield user, :header %>
   #     Budget: $<%= user.budget %>
   #     <%= yield user, :footer %>
   #   </div>
   #
-  #   <%# app/views/users/index.html.erb &>
+  #   <%# app/views/users/index.html.erb %>
   #   <%= render layout: @users do |user, section| %>
   #     <%- case section when :header -%>
   #       Title: <%= user.title %>
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index cc03e37a12..93550a69f1 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -258,7 +258,7 @@ module ActiveRecord #:nodoc:
   #   <tt>attributes=</tt> method. The +errors+ property of this exception contains an array of
   #   AttributeAssignmentError
   #   objects that should be inspected to determine which attributes triggered the errors.
-  # * RecordInvalid - raised by save! and create! when the record is invalid.
+  # * RecordInvalid - raised by <tt>save!</tt> and <tt>create!</tt> when the record is invalid.
   # * RecordNotFound - No record responded to the +find+ method. Either the row with the given ID doesn't exist
   #   or the row didn't meet the additional restrictions. Some +find+ calls do not raise this exception to signal
   #   nothing was found, please check its documentation for further details.
diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index bae4e206e6..c676b26b06 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -13,7 +13,7 @@ class ERB
     # This method is also aliased as <tt>h</tt>.
     #
     # In your ERB templates, use this method to escape any unsafe content. For example:
-    #   <%=h @person.name %>
+    #   <%= h @person.name %>
     #
     #   puts html_escape('is a > 0 & a < 10?')
     #   # => is a &gt; 0 &amp; a &lt; 10?
diff --git a/guides/source/4_0_release_notes.md b/guides/source/4_0_release_notes.md
index bbc0efa3ea..9feaff098a 100644
--- a/guides/source/4_0_release_notes.md
+++ b/guides/source/4_0_release_notes.md
@@ -59,25 +59,25 @@ Major Features
 
 ### Upgrade
 
- * **Ruby 1.9.3** ([commit](https://github.com/rails/rails/commit/a0380e808d3dbd2462df17f5d3b7fcd8bd812496)) - Ruby 2.0 preferred; 1.9.3+ required
- * **[New deprecation policy](http://www.youtube.com/watch?v=z6YgD6tVPQs)** - Deprecated features are warnings in Rails 4.0 and will be removed in Rails 4.1.
- * **ActionPack page and action caching** ([commit](https://github.com/rails/rails/commit/b0a7068564f0c95e7ef28fc39d0335ed17d93e90)) - Page and action caching are extracted to a separate gem. Page and action caching requires too much manual intervention (manually expiring caches when the underlying model objects are updated). Instead, use Russian doll caching.
- * **ActiveRecord observers** ([commit](https://github.com/rails/rails/commit/ccecab3ba950a288b61a516bf9b6962e384aae0b)) - Observers are extracted to a separate gem. Observers are only needed for page and action caching, and can lead to spaghetti code.
- * **ActiveRecord session store** ([commit](https://github.com/rails/rails/commit/0ffe19056c8e8b2f9ae9d487b896cad2ce9387ad)) - The ActiveRecord session store is extracted to a separate gem. Storing sessions in SQL is costly. Instead, use cookie sessions, memcache sessions, or a custom session store.
- * **ActiveModel mass assignment protection** ([commit](https://github.com/rails/rails/commit/f8c9a4d3e88181cee644f91e1342bfe896ca64c6)) - Rails 3 mass assignment protection is deprecated. Instead, use strong parameters.
- * **ActiveResource** ([commit](https://github.com/rails/rails/commit/f1637bf2bb00490203503fbd943b73406e043d1d)) - ActiveResource is extracted to a separate gem. ActiveResource was not widely used.
- * **vendor/plugins removed** ([commit](https://github.com/rails/rails/commit/853de2bd9ac572735fa6cf59fcf827e485a231c3)) - Use a Gemfile to manage installed gems.
+* **Ruby 1.9.3** ([commit](https://github.com/rails/rails/commit/a0380e808d3dbd2462df17f5d3b7fcd8bd812496)) - Ruby 2.0 preferred; 1.9.3+ required
+* **[New deprecation policy](http://www.youtube.com/watch?v=z6YgD6tVPQs)** - Deprecated features are warnings in Rails 4.0 and will be removed in Rails 4.1.
+* **ActionPack page and action caching** ([commit](https://github.com/rails/rails/commit/b0a7068564f0c95e7ef28fc39d0335ed17d93e90)) - Page and action caching are extracted to a separate gem. Page and action caching requires too much manual intervention (manually expiring caches when the underlying model objects are updated). Instead, use Russian doll caching.
+* **ActiveRecord observers** ([commit](https://github.com/rails/rails/commit/ccecab3ba950a288b61a516bf9b6962e384aae0b)) - Observers are extracted to a separate gem. Observers are only needed for page and action caching, and can lead to spaghetti code.
+* **ActiveRecord session store** ([commit](https://github.com/rails/rails/commit/0ffe19056c8e8b2f9ae9d487b896cad2ce9387ad)) - The ActiveRecord session store is extracted to a separate gem. Storing sessions in SQL is costly. Instead, use cookie sessions, memcache sessions, or a custom session store.
+* **ActiveModel mass assignment protection** ([commit](https://github.com/rails/rails/commit/f8c9a4d3e88181cee644f91e1342bfe896ca64c6)) - Rails 3 mass assignment protection is deprecated. Instead, use strong parameters.
+* **ActiveResource** ([commit](https://github.com/rails/rails/commit/f1637bf2bb00490203503fbd943b73406e043d1d)) - ActiveResource is extracted to a separate gem. ActiveResource was not widely used.
+* **vendor/plugins removed** ([commit](https://github.com/rails/rails/commit/853de2bd9ac572735fa6cf59fcf827e485a231c3)) - Use a Gemfile to manage installed gems.
 
 ### ActionPack
 
- * **Strong parameters** ([commit](https://github.com/rails/rails/commit/a8f6d5c6450a7fe058348a7f10a908352bb6c7fc)) - Only allow whitelisted parameters to update model objects (`params.permit(:title, :text)`).
- * **Routing concerns** ([commit](https://github.com/rails/rails/commit/0dd24728a088fcb4ae616bb5d62734aca5276b1b)) - In the routing DSL, factor out common subroutes (`comments` from `/posts/1/comments` and `/videos/1/comments`).
- * **ActionController::Live** ([commit](https://github.com/rails/rails/commit/af0a9f9eefaee3a8120cfd8d05cbc431af376da3)) - Stream JSON with `response.stream`.
- * **Declarative ETags** ([commit](https://github.com/rails/rails/commit/ed5c938fa36995f06d4917d9543ba78ed506bb8d)) - Add controller-level etag additions that will be part of the action etag computation.
- * **[Russian doll caching](http://37signals.com/svn/posts/3113-how-key-based-cache-expiration-works)** ([commit](https://github.com/rails/rails/commit/4154bf012d2bec2aae79e4a49aa94a70d3e91d49)) - Cache nested fragments of views. Each fragment expires based on a set of dependencies (a cache key). The cache key is usually a template version number and a model object.
- * **Turbolinks** ([commit](https://github.com/rails/rails/commit/e35d8b18d0649c0ecc58f6b73df6b3c8d0c6bb74)) - Serve only one initial HTML page. When the user navigates to another page, use pushState to update the URL and use AJAX to update the title and body.
- * **Decouple ActionView from ActionController** ([commit](https://github.com/rails/rails/commit/78b0934dd1bb84e8f093fb8ef95ca99b297b51cd)) - ActionView was decoupled from ActionPack and will be moved to a separated gem in Rails 4.1.
- * **Do not depend on ActiveModel** ([commit](https://github.com/rails/rails/commit/166dbaa7526a96fdf046f093f25b0a134b277a68)) - ActionPack no longer depends on ActiveModel.
+* **Strong parameters** ([commit](https://github.com/rails/rails/commit/a8f6d5c6450a7fe058348a7f10a908352bb6c7fc)) - Only allow whitelisted parameters to update model objects (`params.permit(:title, :text)`).
+* **Routing concerns** ([commit](https://github.com/rails/rails/commit/0dd24728a088fcb4ae616bb5d62734aca5276b1b)) - In the routing DSL, factor out common subroutes (`comments` from `/posts/1/comments` and `/videos/1/comments`).
+* **ActionController::Live** ([commit](https://github.com/rails/rails/commit/af0a9f9eefaee3a8120cfd8d05cbc431af376da3)) - Stream JSON with `response.stream`.
+* **Declarative ETags** ([commit](https://github.com/rails/rails/commit/ed5c938fa36995f06d4917d9543ba78ed506bb8d)) - Add controller-level etag additions that will be part of the action etag computation.
+* **[Russian doll caching](http://37signals.com/svn/posts/3113-how-key-based-cache-expiration-works)** ([commit](https://github.com/rails/rails/commit/4154bf012d2bec2aae79e4a49aa94a70d3e91d49)) - Cache nested fragments of views. Each fragment expires based on a set of dependencies (a cache key). The cache key is usually a template version number and a model object.
+* **Turbolinks** ([commit](https://github.com/rails/rails/commit/e35d8b18d0649c0ecc58f6b73df6b3c8d0c6bb74)) - Serve only one initial HTML page. When the user navigates to another page, use pushState to update the URL and use AJAX to update the title and body.
+* **Decouple ActionView from ActionController** ([commit](https://github.com/rails/rails/commit/78b0934dd1bb84e8f093fb8ef95ca99b297b51cd)) - ActionView was decoupled from ActionPack and will be moved to a separated gem in Rails 4.1.
+* **Do not depend on ActiveModel** ([commit](https://github.com/rails/rails/commit/166dbaa7526a96fdf046f093f25b0a134b277a68)) - ActionPack no longer depends on ActiveModel.
 
 ### General
 
@@ -95,9 +95,9 @@ NOTE: Check that the gems you are using are threadsafe.
 
 ### Security
 
- * **match do not catch all** ([commit](https://github.com/rails/rails/commit/90d2802b71a6e89aedfe40564a37bd35f777e541)) - In the routing DSL, match requires the HTTP verb or verbs to be specified.
- * **html entities escaped by default** ([commit](https://github.com/rails/rails/commit/5f189f41258b83d49012ec5a0678d827327e7543)) - Strings rendered in erb are escaped unless wrapped with `raw` or `html_safe` is called.
- * **New security headers** ([commit](https://github.com/rails/rails/commit/6794e92b204572d75a07bd6413bdae6ae22d5a82)) - Rails sends the following headers with every HTTP request: `X-Frame-Options` (prevents clickjacking by forbidding the browser from embedding the page in a frame), `X-XSS-Protection` (asks the browser to halt script injection) and `X-Content-Type-Options` (prevents the browser from opening a jpeg as an exe).
+* **match do not catch all** ([commit](https://github.com/rails/rails/commit/90d2802b71a6e89aedfe40564a37bd35f777e541)) - In the routing DSL, match requires the HTTP verb or verbs to be specified.
+* **html entities escaped by default** ([commit](https://github.com/rails/rails/commit/5f189f41258b83d49012ec5a0678d827327e7543)) - Strings rendered in erb are escaped unless wrapped with `raw` or `html_safe` is called.
+* **New security headers** ([commit](https://github.com/rails/rails/commit/6794e92b204572d75a07bd6413bdae6ae22d5a82)) - Rails sends the following headers with every HTTP request: `X-Frame-Options` (prevents clickjacking by forbidding the browser from embedding the page in a frame), `X-XSS-Protection` (asks the browser to halt script injection) and `X-Content-Type-Options` (prevents the browser from opening a jpeg as an exe).
 
 Extraction of features to gems
 ---------------------------
diff --git a/guides/source/4_2_release_notes.md b/guides/source/4_2_release_notes.md
index b7ab374c8b..684bd286bc 100644
--- a/guides/source/4_2_release_notes.md
+++ b/guides/source/4_2_release_notes.md
@@ -257,7 +257,7 @@ application is using any of these spellings, you will need to update them:
 *   Values in attribute selectors may need to be quoted if they contain
     non-alphanumeric characters.
 
-    ```
+    ```ruby
     # before
     a[href=/]
     a[href$=/]
@@ -272,7 +272,7 @@ application is using any of these spellings, you will need to update them:
 
     For example:
 
-    ``` ruby
+    ```ruby
     # content: <div><i><p></i></div>
 
     # before:
@@ -290,7 +290,7 @@ application is using any of these spellings, you will need to update them:
     used to be raw (e.g. `AT&amp;T`), and now is evaluated
     (e.g. `AT&T`).
 
-    ``` ruby
+    ```ruby
     # content: <p>AT&amp;T</p>
 
     # before:
diff --git a/guides/source/command_line.md b/guides/source/command_line.md
index d153e0bfa6..b409f20122 100644
--- a/guides/source/command_line.md
+++ b/guides/source/command_line.md
@@ -402,7 +402,7 @@ INFO: You can also use `rake -T`  to get the list of tasks.
 $ bin/rake about
 About your application's environment
 Rails version             5.0.0
-Ruby version              2.2.0 (x86_64-linux)
+Ruby version              2.2.1 (x86_64-linux)
 RubyGems version          2.4.5
 Rack version              1.6
 JavaScript Runtime        Node.js (V8)
diff --git a/guides/source/form_helpers.md b/guides/source/form_helpers.md
index 2b71b5e04e..853227e2a1 100644
--- a/guides/source/form_helpers.md
+++ b/guides/source/form_helpers.md
@@ -241,7 +241,7 @@ Upon form submission the value entered by the user will be stored in `params[:pe
 
 WARNING: You must pass the name of an instance variable, i.e. `:person` or `"person"`, not an actual instance of your model object.
 
-Rails provides helpers for displaying the validation errors associated with a model object. These are covered in detail by the [Active Record Validations](./active_record_validations.html#displaying-validation-errors-in-views) guide.
+Rails provides helpers for displaying the validation errors associated with a model object. These are covered in detail by the [Active Record Validations](active_record_validations.html#displaying-validation-errors-in-views) guide.
 
 ### Binding a Form to an Object
 
diff --git a/guides/source/getting_started.md b/guides/source/getting_started.md
index fe01088b2e..922ec3922e 100644
--- a/guides/source/getting_started.md
+++ b/guides/source/getting_started.md
@@ -1522,7 +1522,7 @@ This command will generate four files:
 | -------------------------------------------- | ------------------------------------------------------------------------------------------------------ |
 | db/migrate/20140120201010_create_comments.rb | Migration to create the comments table in your database (your name will include a different timestamp) |
 | app/models/comment.rb                        | The Comment model                                                                                      |
-| test/models/comment_test.rb                  | Testing harness for the comments model                                                                 |
+| test/models/comment_test.rb                  | Testing harness for the comment model                                                                 |
 | test/fixtures/comments.yml                   | Sample comments for use in testing                                                                     |
 
 First, take a look at `app/models/comment.rb`:
diff --git a/guides/source/routing.md b/guides/source/routing.md
index 1a614fe42b..7d0a3efbe7 100644
--- a/guides/source/routing.md
+++ b/guides/source/routing.md
@@ -909,7 +909,7 @@ The `:as` option lets you override the normal naming for the named route helpers
 resources :photos, as: 'images'
 ```
 
-will recognize incoming paths beginning with `/photos` and route the requests to `PhotosController`, but use the value of the :as option to name the helpers.
+will recognize incoming paths beginning with `/photos` and route the requests to `PhotosController`, but use the value of the `:as` option to name the helpers.
 
 | HTTP Verb | Path             | Controller#Action | Named Helper         |
 | --------- | ---------------- | ----------------- | -------------------- |
diff --git a/guides/source/testing.md b/guides/source/testing.md
index fe5dd0b820..752ef48b16 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -162,7 +162,7 @@ project is created.
 
 We will cover each of types Rails tests listed above in this guide.
 
-Unit Testing your Models
+Model Testing
 ------------------------
 
 In Rails, unit tests are what you write to test your models.
@@ -929,7 +929,7 @@ assert_select_email do
 end
 ```
 
-Testing helpers
+Testing Helpers
 ---------------
 
 In order to test helpers, all you need to do is check that the output of the