Capitalize "Rails" [ci-skip]

Author: jonathanhefner

activemodel/lib/active_model/validations/validates.rb

@@ -10,7 +10,7 @@ module ClassMethods
       # validators can be overridden inside specific classes by creating
       # custom validator classes in their place such as PresenceValidator.
       #
-      # Examples of using the default rails validators:
+      # Examples of using the default Rails validators:
       #
       #   validates :username, absence: true
       #   validates :terms, acceptance: true

guides/source/2_3_release_notes.md

@@ -469,7 +469,7 @@ options_from_collection_for_select(@product.sizes, :name, :id, :disabled => lamb
 ```
 
 * Lead Contributor: [Tekin Suleyman](http://tekin.co.uk/)
-* More Information: [New in rails 2.3 - disabled option tags and lambdas for selecting and disabling options from collections](https://tekin.co.uk/2009/03/new-in-rails-23-disabled-option-tags-and-lambdas-for-selecting-and-disabling-options-from-collections)
+* More Information: [New in Rails 2.3 - disabled option tags and lambdas for selecting and disabling options from collections](https://tekin.co.uk/2009/03/new-in-rails-23-disabled-option-tags-and-lambdas-for-selecting-and-disabling-options-from-collections)
 
 ### A Note About Template Loading
 

guides/source/7_1_release_notes.md

@@ -23,7 +23,7 @@ Major Features
 
 ### Generate Dockerfiles for new Rails applications
 
-[Default Docker support](https://github.com/rails/rails/pull/46762) to new rails applications.
+[Default Docker support](https://github.com/rails/rails/pull/46762) to new Rails applications.
 When generating a new application, Rails will now include Docker-related files in the application.
 
 These files serve as a foundational setup for deploying your Rails application in a

guides/source/active_storage_overview.md

@@ -463,7 +463,7 @@ end
 ```
 
 If you know in advance that your variants will be accessed, you can specify that
-rails should generate them ahead of time:
+Rails should generate them ahead of time:
 
 ```ruby
 class User < ApplicationRecord

guides/source/generators.md

@@ -31,7 +31,7 @@ $ cd myapp
 $ bin/rails generate
 ```
 
-NOTE: To create a rails application we use the `rails` global command which uses
+NOTE: To create a Rails application we use the `rails` global command which uses
 the version of Rails installed via `gem install rails`. When inside the
 directory of your application, we use the `bin/rails` command which uses the
 version of Rails bundled with the application.

railties/lib/rails/generators/base.rb

@@ -222,7 +222,7 @@ def self.class_option(name, options = {}) # :nodoc:
       end
 
       # Returns the default source root for a given generator. This is used internally
-      # by rails to set its generators source root. If you want to customize your source
+      # by Rails to set its generators source root. If you want to customize your source
       # root, you should use source_root.
       def self.default_source_root
         return unless base_name && generator_name