Example updated [ci skip]

Should be ApplicationController not ApplicationController::Base

actionview/lib/action_view/helpers/atom_feed_helper.rb

@@ -16,7 +16,7 @@ module AtomFeedHelper
       #     end
       #
       #   app/controllers/posts_controller.rb:
-      #     class PostsController < ApplicationController::Base
+      #     class PostsController < ApplicationController
       #       # GET /posts.html
       #       # GET /posts.atom
       #       def index