Fix RDOC headings for Action View Helpers [ci-skip]

The Action View Helpers already had RDOC headings but most were on the
wrong namespace causing them to not show up in the API docs.

This moves them to the correct namespace, adds some missing headers and
adds escaping.

Author: p8

actionview/lib/action_view/helpers/active_model_helper.rb

@@ -4,11 +4,11 @@
 require "active_support/core_ext/enumerable"
 
 module ActionView
-  # = Active Model Helpers
   module Helpers # :nodoc:
     module ActiveModelHelper
     end
 
+    # = Active \Model Instance Tag \Helpers
     module ActiveModelInstanceTag
       def object
         @active_model_object ||= begin

actionview/lib/action_view/helpers/asset_tag_helper.rb

@@ -7,8 +7,9 @@
 require "action_view/helpers/tag_helper"
 
 module ActionView
-  # = Action View Asset Tag Helpers
   module Helpers # :nodoc:
+    # = Action View Asset Tag \Helpers
+    #
     # This module provides methods for generating HTML that links views to assets such
     # as images, JavaScripts, stylesheets, and feeds. These methods do not verify
     # the assets exist before linking to them:

actionview/lib/action_view/helpers/asset_url_helper.rb

@@ -3,8 +3,9 @@
 require "zlib"
 
 module ActionView
-  # = Action View Asset URL Helpers
   module Helpers # :nodoc:
+    # = Action View Asset URL \Helpers
+    #
     # This module provides methods for generating asset paths and
     # URLs.
     #

actionview/lib/action_view/helpers/atom_feed_helper.rb

@@ -3,8 +3,8 @@
 require "set"
 
 module ActionView
-  # = Action View Atom Feed Helpers
   module Helpers # :nodoc:
+    # = Action View Atom Feed \Helpers
     module AtomFeedHelper
       # Adds easy defaults to writing Atom feeds with the Builder template engine (this does not work on ERB or any other
       # template languages).

actionview/lib/action_view/helpers/cache_helper.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 module ActionView
-  # = Action View Cache Helper
   module Helpers # :nodoc:
+    # = Action View Cache \Helpers
     module CacheHelper
       class UncacheableFragmentError < StandardError; end
 

actionview/lib/action_view/helpers/capture_helper.rb

@@ -3,8 +3,9 @@
 require "active_support/core_ext/string/output_safety"
 
 module ActionView
-  # = Action View Capture Helper
   module Helpers # :nodoc:
+    # = Action View Capture \Helpers
+    #
     # \CaptureHelper exposes methods to let you extract generated markup which
     # can be used in other parts of a template or layout file.
     #

actionview/lib/action_view/helpers/controller_helper.rb

@@ -4,6 +4,8 @@
 
 module ActionView
   module Helpers # :nodoc:
+    # = Action View Controller \Helpers
+    #
     # This module keeps all methods and behavior in ActionView
     # that simply delegates to the controller.
     module ControllerHelper # :nodoc:

actionview/lib/action_view/helpers/csp_helper.rb

@@ -1,9 +1,10 @@
 # frozen_string_literal: true
 
 module ActionView
-  # = Action View CSP Helper
   module Helpers # :nodoc:
     module CspHelper
+      # = Action View CSP \Helpers
+      #
       # Returns a meta tag "csp-nonce" with the per-session nonce value
       # for allowing inline <script> tags.
       #

actionview/lib/action_view/helpers/csrf_helper.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 module ActionView
-  # = Action View CSRF Helper
   module Helpers # :nodoc:
+    # = Action View CSRF \Helpers
     module CsrfHelper
       # Returns meta tags "csrf-param" and "csrf-token" with the name of the cross-site
       # request forgery protection parameter and token, respectively.

actionview/lib/action_view/helpers/date_helper.rb

@@ -10,7 +10,7 @@
 
 module ActionView
   module Helpers # :nodoc:
-    # = Action View Date Helpers
+    # = Action View Date \Helpers
     #
     # The Date Helper primarily creates select/option tags for different kinds of dates and times or date and time
     # elements. All of the select-type methods share a number of common options that are as follows: