Tiny documentation edits [ci skip]

actionpack/lib/action_controller/metal/helpers.rb

@@ -93,7 +93,7 @@ def modules_for_helpers(args)
         super(args)
       end
 
-      # Return a list of helper names in specific path.
+      # Returns a list of helper names in a given path.
       #
       #   ActionController::Base.all_helpers_from_path 'app/helpers'
       #   # => ["application", "chart", "rubygems"]

guides/source/debugging_rails_applications.md

@@ -815,7 +815,7 @@ calling the `console` method.
 For example, in a controller:
 
 ```ruby
-class PostController < ApplicationController
+class PostsController < ApplicationController
   def new
     console
     @post = Post.new