Add missing headers to Action Mailbox/Mailer/Text/View docs [ci-skip]

Having a h1 heading will improve SEO and makes things look more consistent.

actionmailbox/lib/action_mailbox/base.rb

@@ -6,6 +6,8 @@
 require "action_mailbox/routing"
 
 module ActionMailbox
+  # = Action Mailbox \Base
+  #
   # The base class for all application mailboxes. Not intended to be inherited from directly. Inherit from
   # +ApplicationMailbox+ instead, as that's where the app-specific routing is configured. This routing
   # is specified in the following ways:

actionmailbox/lib/action_mailbox/callbacks.rb

@@ -3,6 +3,8 @@
 require "active_support/callbacks"
 
 module ActionMailbox
+  # = Action Mailbox \Callbacks
+  #
   # Defines the callbacks related to processing.
   module Callbacks
     extend  ActiveSupport::Concern

actionmailbox/lib/action_mailbox/router.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionMailbox
+  # = Action Mailbox \Router
+  #
   # Encapsulates the routes that live on the ApplicationMailbox and performs the actual routing when
   # an inbound_email is received.
   class Router

actionmailer/lib/action_mailer/base.rb

@@ -10,6 +10,8 @@
 require "action_mailer/rescuable"
 
 module ActionMailer
+  # = Action Mailer \Base
+  #
   # Action Mailer allows you to send email from your application using a mailer model and views.
   #
   # = Mailer Models

actionmailer/lib/action_mailer/delivery_methods.rb

@@ -3,6 +3,8 @@
 require "tmpdir"
 
 module ActionMailer
+  # = Action Mailer \DeliveryMethods
+  #
   # This module handles everything related to mail delivery, from registering
   # new delivery methods to configuring the mail object to be sent.
   module DeliveryMethods

actionmailer/lib/action_mailer/inline_preview_interceptor.rb

@@ -3,6 +3,8 @@
 require "base64"
 
 module ActionMailer
+  # = Action Mailer \InlinePreviewInterceptor
+  #
   # Implements a mailer preview interceptor that converts image tag src attributes
   # that use inline cid: style URLs to data: style URLs so that they are visible
   # when previewing an HTML email in a web browser.

actionmailer/lib/action_mailer/log_subscriber.rb

@@ -3,6 +3,8 @@
 require "active_support/log_subscriber"
 
 module ActionMailer
+  # = Action Mailer \LogSubscriber
+  #
   # Implements the ActiveSupport::LogSubscriber for logging notifications when
   # email is delivered or received.
   class LogSubscriber < ActiveSupport::LogSubscriber

actionmailer/lib/action_mailer/mail_delivery_job.rb

@@ -3,6 +3,8 @@
 require "active_job"
 
 module ActionMailer
+  # = Action Mailer \MailDeliveryJob
+  #
   # The <tt>ActionMailer::MailDeliveryJob</tt> class is used when you
   # want to send emails outside of the request-response cycle. It supports
   # sending either parameterized or normal mail.

actionmailer/lib/action_mailer/mail_helper.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionMailer
+  # = Action Mailer \MailHelper
+  #
   # Provides helper methods for ActionMailer::Base that can be used for easily
   # formatting messages, accessing mailer or message instances, and the
   # attachments list.

actionmailer/lib/action_mailer/message_delivery.rb

@@ -3,6 +3,8 @@
 require "delegate"
 
 module ActionMailer
+  # = Action Mailer \MessageDelivery
+  #
   # The <tt>ActionMailer::MessageDelivery</tt> class is used by
   # ActionMailer::Base when creating a new mailer.
   # <tt>MessageDelivery</tt> is a wrapper (+Delegator+ subclass) around a lazy

actionmailer/lib/action_mailer/parameterized.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionMailer
+  # = Action Mailer \Parameterized
+  #
   # Provides the option to parameterize mailers in order to share instance variable
   # setup, processing, and common headers.
   #

actionmailer/lib/action_mailer/rescuable.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionMailer # :nodoc:
+  # = Action Mailer \Rescuable
+  #
   # Provides +rescue_from+ for mailers. Wraps mailer action processing,
   # mail job processing, and mail delivery.
   module Rescuable

actiontext/app/models/action_text/rich_text.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionText
+  # = Action Text \RichText
+  #
   # The RichText record holds the content produced by the Trix editor in a serialized +body+ attribute.
   # It also holds all the references to the embedded files, which are stored using Active Storage.
   # This record is then associated with the Active Record model the application desires to have

actiontext/lib/action_text/fixture_set.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionText
+  # = Action Text \FixtureSet
+  #
   # Fixtures are a way of organizing data that you want to test against; in
   # short, sample data.
   #

actionview/lib/action_view/base.rb

@@ -10,7 +10,7 @@
 require "action_view/lookup_context"
 
 module ActionView # :nodoc:
-  # = Action View Base
+  # = Action View \Base
   #
   # Action View templates can be written in several ways.
   # If the template file has a <tt>.erb</tt> extension, then it uses the erubi[https://rubygems.org/gems/erubi]

actionview/lib/action_view/layouts.rb

@@ -4,6 +4,8 @@
 require "active_support/core_ext/module/redefine_method"
 
 module ActionView
+  # = Action View \Layouts
+  #
   # Layouts reverse the common pattern of including shared headers and footers in many templates to isolate changes in
   # repeated setups. The inclusion pattern has pages that look like this:
   #

actionview/lib/action_view/record_identifier.rb

@@ -4,6 +4,8 @@
 require "action_view/model_naming"
 
 module ActionView
+  # = Action View \Record \Identifier
+  #
   # RecordIdentifier encapsulates methods used by various ActionView helpers
   # to associate records with DOM elements.
   #

actionview/lib/action_view/renderer/renderer.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionView
+  # = Action View \Renderer
+  #
   # This is the main entry point for rendering. It basically delegates
   # to other objects like TemplateRenderer and PartialRenderer which
   # actually renders the template.

actionview/lib/action_view/template_path.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module ActionView
+  # = Action View \TemplatePath
+  #
   # Represents a template path within ActionView's lookup and rendering system,
   # like "users/show"
   #