add :nodoc: to AV StylesheetIncludeTag, JavascriptIncludeTag and AssetIncludeTag

actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb

@@ -7,7 +7,7 @@ module ActionView
   module Helpers
     module AssetTagHelper
 
-      class AssetIncludeTag
+      class AssetIncludeTag #:nodoc:
         include TagHelper
 
         attr_reader :config, :asset_paths

actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb

@@ -6,7 +6,7 @@ module ActionView
   module Helpers
     module AssetTagHelper
 
-      class JavascriptIncludeTag < AssetIncludeTag
+      class JavascriptIncludeTag < AssetIncludeTag #:nodoc:
         def asset_name
           'javascript'
         end

actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb

@@ -6,7 +6,7 @@ module ActionView
   module Helpers
     module AssetTagHelper
 
-      class StylesheetIncludeTag < AssetIncludeTag
+      class StylesheetIncludeTag < AssetIncludeTag #:nodoc:
         def asset_name
           'stylesheet'
         end