Remove mention to register_javascript_include_default in documentation

actionpack/lib/action_view/helpers/asset_tag_helper.rb

@@ -292,9 +292,6 @@ def javascript_path(source)
       #
       # * = The application.js file is only referenced if it exists
       #
-      # Though it's not really recommended practice, if you need to extend the default JavaScript set for any reason
-      # (e.g., you're going to be using a certain .js file in every action), then take a look at the register_javascript_include_default method.
-      #
       # You can also include all javascripts in the +javascripts+ directory using <tt>:all</tt> as the source:
       #
       #   javascript_include_tag :all # =>

railties/guides/source/action_view_overview.textile

@@ -253,9 +253,6 @@ javascript_include_tag :monkey # =>
   <script type="text/javascript" src="/javascripts/tail.js"></script>
 </ruby>
 
-h5. register_javascript_include_default
-
-Register one or more additional JavaScript files to be included when +javascript_include_tag :defaults+ is called. This method is typically intended to be called from plugin initialization to register additional +.js+ files that the plugin installed in +public/javascripts+.
 
 h5. register_stylesheet_expansion