diff --git a/actionmailer/README.rdoc b/actionmailer/README.rdoc
index b4eb40f54d..a4e660d621 100644
--- a/actionmailer/README.rdoc
+++ b/actionmailer/README.rdoc
@@ -74,14 +74,17 @@ Or you can just chain the methods together like:
 
 == Setting defaults
 
-It is possible to set default values that will be used in every method in your Action Mailer class.
-To implement this functionality, you just call the public class method <tt>default</tt> which you get for free from
-<tt>ActionMailer::Base</tt>. This method accepts a Hash as the parameter. You can use any of the headers, email messages
-have, like <tt>:from</tt> as the key. You can also pass in a string as the key, like "Content-Type", but Action Mailer
-does this out of the box for you, so you won't need to worry about that.
-Finally, it is also possible to pass in a Proc that will get evaluated when it is needed.
+It is possible to set default values that will be used in every method in your
+Action Mailer class. To implement this functionality, you just call the public
+class method +default+ which you get for free from <tt>ActionMailer::Base</tt>.
+This method accepts a Hash as the parameter. You can use any of the headers,
+email messages have, like +:from+ as the key. You can also pass in a string as
+the key, like "Content-Type", but Action Mailer does this out of the box for you,
+so you won't need to worry about that. Finally, it is also possible to pass in a
+Proc that will get evaluated when it is needed.
 
-Note that every value you set with this method will get overwritten if you use the same key in your mailer method.
+Note that every value you set with this method will get overwritten if you use the
+same key in your mailer method.
 
 Example:
 
@@ -92,10 +95,11 @@ Example:
 
 == Receiving emails
 
-To receive emails, you need to implement a public instance method called <tt>receive</tt> that takes an
-email object as its single parameter. The Action Mailer framework has a corresponding class method,
-which is also called <tt>receive</tt>, that accepts a raw, unprocessed email as a string, which it then turns
-into the email object and calls the receive instance method.
+To receive emails, you need to implement a public instance method called
++receive+ that takes an email object as its single parameter. The Action Mailer
+framework has a corresponding class method, which is also called +receive+, that
+accepts a raw, unprocessed email as a string, which it then turns into the email
+object and calls the receive instance method.
 
 Example:
 
@@ -116,13 +120,14 @@ Example:
     end
   end
 
-This Mailman can be the target for Postfix or other MTAs. In Rails, you would use the runner in the
-trivial case like this:
+This Mailman can be the target for Postfix or other MTAs. In Rails, you would use
+the runner in the trivial case like this:
 
   rails runner 'Mailman.receive(STDIN.read)'
 
-However, invoking Rails in the runner for each mail to be received is very resource intensive.  A single
-instance of Rails should be run within a daemon, if it is going to process more than just a limited amount of email.
+However, invoking Rails in the runner for each mail to be received is very
+resource intensive. A single instance of Rails should be run within a daemon, if
+it is going to process more than just a limited amount of email.
 
 == Configuration
 
diff --git a/activejob/lib/active_job/queue_adapters.rb b/activejob/lib/active_job/queue_adapters.rb
index efbcd3cb3a..f22b0502dc 100644
--- a/activejob/lib/active_job/queue_adapters.rb
+++ b/activejob/lib/active_job/queue_adapters.rb
@@ -13,7 +13,7 @@ module ActiveJob
   # * {Sneakers}[https://github.com/jondot/sneakers]
   # * {Sucker Punch}[https://github.com/brandonhilkert/sucker_punch]
   #
-  # #### Backends Features
+  # === Backends Features
   #
   #   |                   | Async | Queues | Delayed   | Priorities | Timeout | Retries |
   #   |-------------------|-------|--------|-----------|------------|---------|---------|
diff --git a/guides/source/asset_pipeline.md b/guides/source/asset_pipeline.md
index e552c3804d..ae0f19c02a 100644
--- a/guides/source/asset_pipeline.md
+++ b/guides/source/asset_pipeline.md
@@ -1347,7 +1347,8 @@ config.assets.digest = true
 
 Rails 4 no longer sets default config values for Sprockets in `test.rb`, so
 `test.rb` now requires Sprockets configuration. The old defaults in the test
-environment are: `config.assets.compile = true`, `config.assets.compress = false`, `config.assets.debug = false` and `config.assets.digest = false`.
+environment are: `config.assets.compile = true`, `config.assets.compress = false`,
+`config.assets.debug = false` and `config.assets.digest = false`.
 
 The following should also be added to `Gemfile`: