Fix documentation typo

lib/devise/rails/routes.rb

@@ -93,7 +93,7 @@ class Mapper
     #
     #    Also pay attention that when you use a namespace it will affect all the helpers and methods for controllers
     #    and views. For example, using the above setup you'll end with following methods:
-    #    current_publisher_account, authenticate_publisher_account!, pusblisher_account_signed_in, etc.
+    #    current_publisher_account, authenticate_publisher_account!, publisher_account_signed_in, etc.
     #
     #  * :skip => tell which controller you want to skip routes from being created:
     #