chore: fix grammar and spelling in Markdown and Ruby files

guides/source/action_controller_overview.md

@@ -1078,7 +1078,7 @@ be able to send arbitrary data to the browser at specific points in time.
 #### Incorporating Live Streaming
 
 Including `ActionController::Live` inside of your controller class will provide
-all actions inside of the controller the ability to stream data. You can mix in
+all actions inside the controller the ability to stream data. You can mix in
 the module like so:
 
 ```ruby
@@ -1191,7 +1191,7 @@ Rescue
 
 Most likely your application is going to contain bugs or otherwise throw an exception that needs to be handled. For example, if the user follows a link to a resource that no longer exists in the database, Active Record will throw the `ActiveRecord::RecordNotFound` exception.
 
-Rails default exception handling displays a "500 Server Error" message for all exceptions. If the request was made locally, a nice traceback and some added information gets displayed, so you can figure out what went wrong and deal with it. If the request was remote Rails will just display a simple "500 Server Error" message to the user, or a "404 Not Found" if there was a routing error or a record could not be found. Sometimes you might want to customize how these errors are caught and how they're displayed to the user. There are several levels of exception handling available in a Rails application:
+Rails default exception handling displays a "500 Server Error" message for all exceptions. If the request was made locally, a nice traceback and some added information gets displayed, so you can figure out what went wrong and deal with it. If the request was remote Rails will just display a simple "500 Server Error" message to the user, or a "404 Not Found" if there was a routing error, or a record could not be found. Sometimes you might want to customize how these errors are caught and how they're displayed to the user. There are several levels of exception handling available in a Rails application:
 
 ### The Default 500 and 404 Templates
 

guides/source/action_mailbox_basics.md

@@ -76,7 +76,7 @@ $ bin/rails action_mailbox:ingress:exim URL=https://example.com/rails/action_mai
 ### Mailgun
 
 Give Action Mailbox your
-Mailgun Signing key (which you can find under Settings -> Security & Users -> API security in Mailgun)
+Mailgun Signing key (which you can find under Settings -> Security & Users -> API security in Mailgun),
 so it can authenticate requests to the Mailgun ingress.
 
 Use `bin/rails credentials:edit` to add your Signing key to your application's
@@ -105,7 +105,7 @@ fully-qualified URL `https://example.com/rails/action_mailbox/mailgun/inbound_em
 
 ### Mandrill
 
-Give Action Mailbox your Mandrill API key so it can authenticate requests to
+Give Action Mailbox your Mandrill API key, so it can authenticate requests to
 the Mandrill ingress.
 
 Use `bin/rails credentials:edit` to add your API key to your application's

railties/test/application/configuration_test.rb

@@ -1843,7 +1843,7 @@ module ApplicationTests
 
       app "development"
 
-      # TODO: Test deprecation message, assert_depcrecated { app "development" }
+      # TODO: Test deprecation message, assert_deprecated { app "development" }
       # does not collect it.
 
       assert_equal [X], C.descendants

railties/test/application/rake/multi_dbs_test.rb

@@ -714,7 +714,7 @@ module ApplicationTests
               %>
               adapter: sqlite3
             animals:
-              database: db/develoment_animals.sqlite3
+              database: db/development_animals.sqlite3
               adapter: sqlite3
         YAML
 
@@ -738,7 +738,7 @@ module ApplicationTests
             <% end  %>
               adapter: sqlite3
             animals:
-              database: db/develoment_animals.sqlite3
+              database: db/development_animals.sqlite3
               adapter: sqlite3
 
         YAML
@@ -759,7 +759,7 @@ module ApplicationTests
               database: <% if  Rails.application.config.database %><%= Rails.application.config.database %><% else  %>db/default.sqlite3<% end %>
               adapter: sqlite3
             animals:
-              database: db/develoment_animals.sqlite3
+              database: db/development_animals.sqlite3
               adapter: sqlite3
         YAML
 
@@ -779,7 +779,7 @@ module ApplicationTests
               <%= Rails.application.config.database ? 'database: db/development.sqlite3' : 'database: db/development.sqlite3' %>
               adapter: sqlite3
             animals:
-              database: db/develoment_animals.sqlite3
+              database: db/development_animals.sqlite3
               adapter: sqlite3
         YAML
 
@@ -800,7 +800,7 @@ module ApplicationTests
               custom_option: <%= ENV['CUSTOM_OPTION'] %>
               adapter: sqlite3
             animals:
-              database: db/develoment_animals.sqlite3
+              database: db/development_animals.sqlite3
               adapter: sqlite3
         YAML
 
@@ -820,7 +820,7 @@ module ApplicationTests
               database: db/default.sqlite3
               adapter: sqlite3
             animals:
-              database: db/develoment_animals.sqlite3
+              database: db/development_animals.sqlite3
               adapter: sqlite3
               migrations_paths: db/animals_migrate
         YAML

railties/test/application/zeitwerk_integration_test.rb

@@ -156,7 +156,7 @@ class ZeitwerkIntegrationTest < ActiveSupport::TestCase
       assert require_dependency("#{app_path}/app/models/user.rb")
     end
 
-    test "require_dependency supports arguments that repond to to_path (#{add_aps_to_lp})" do
+    test "require_dependency supports arguments that respond to to_path (#{add_aps_to_lp})" do
       add_to_config "config.add_autoload_paths_to_load_path = #{add_aps_to_lp}"
       app_file "app/models/user.rb", "class User; end"
       boot