Remove one more note about deprecated behavior

actionpack/lib/action_controller/base/layouts.rb

@@ -26,9 +26,6 @@ module ActionController
   #   hello world
   #   // The footer part of this layout
   #
-  # NOTE: The old notation for rendering the view from a layout was to expose the magic <tt>@content_for_layout</tt> instance
-  # variable. The preferred notation now is to use <tt>yield</tt>, as documented above.
-  #
   # == Accessing shared variables
   #
   # Layouts have access to variables specified in the content pages and vice versa. This allows you to have layouts with