Mark _prefix as nodoc

These methods are private API.

Author: rafaelfranca

actionview/lib/action_view/view_paths.rb

@@ -14,7 +14,7 @@ module ViewPaths
              :locale, :locale=, :to => :lookup_context
 
     module ClassMethods
-      def _prefixes
+      def _prefixes # :nodoc:
         @_prefixes ||= begin
           deprecated_prefixes = handle_deprecated_parent_prefixes and return deprecated_prefixes
 
@@ -39,11 +39,10 @@ def handle_deprecated_parent_prefixes # TODO: remove in 4.3/5.0.
     end
 
     # The prefixes used in render "foo" shortcuts.
-    def _prefixes
+    def _prefixes # :nodoc:
       self.class._prefixes
     end
 
-
     # LookupContext is the object responsible to hold all information required to lookup
     # templates, i.e. view paths and details. Check ActionView::LookupContext for more
     # information.