Merge pull request #336 from cakephp/hook-clarification

Clarify hook name

Author: dereuromark

docs/en/index.rst

@@ -27,7 +27,8 @@ Add the authentication middleware to the middleware queue. See the CakePHP `docu
 <http://book.cakephp.org/3.0/en/controllers/middleware.html>`_ on how to use
 middleware if you are not familiar with it.
 
-Example of configuring the authentication middleware using ``authentication`` application hook::
+Example of configuring the authentication middleware using the ``getAuthenticationService()``
+hook within ``Application``::
 
     use Authentication\AuthenticationService;
     use Authentication\AuthenticationServiceProviderInterface;