removed :nodoc: from ActionController::MimeResponds

So we don't miss out on the nice documentation of the respond_to and
respond_with instance methods.  Also added :nodoc: to protected method.

actionpack/lib/action_controller/metal/mime_responds.rb

@@ -2,7 +2,7 @@
 require 'active_support/core_ext/class/attribute'
 
 module ActionController #:nodoc:
-  module MimeResponds #:nodoc:
+  module MimeResponds
     extend ActiveSupport::Concern
 
     included do
@@ -260,7 +260,7 @@ def collect_mimes_from_class_level #:nodoc:
     # Collects mimes and return the response for the negotiated format. Returns
     # nil if :not_acceptable was sent to the client.
     #
-    def retrieve_response_from_mimes(mimes=nil, &block)
+    def retrieve_response_from_mimes(mimes=nil, &block) #:nodoc:
       mimes ||= collect_mimes_from_class_level
       collector = Collector.new(mimes) { |options| default_render(options || {}) }
       block.call(collector) if block_given?