Fix indentation on comment for :path option

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -476,7 +476,7 @@ def initialize(*args) #:nodoc:
         #       resources :posts
         #     end
         # [:path]
-        #  If you want to prefix the route, you could use
+        #   If you want to prefix the route, you could use
         #
         #     scope :path => "/admin" do
         #       resources :posts