Fixed a minor indenttation issue

Author: javiereguiluz

components/routing/hostname_pattern.rst

@@ -289,7 +289,7 @@ Testing your Controllers
 You need to set the Host HTTP header on your request objects if you want to get
 past url matching in your functional tests.
 
- .. code-block:: php
+.. code-block:: php
 
     $crawler = $client->request(
         'GET',