Update routing.rst

Author: javaDeveloperKid

routing.rst

@@ -157,7 +157,7 @@ the ``BlogController``:
 
 .. note::
 
-    By default Symfony only loads the routes defined in YAML format. If you
+    By default Symfony only loads the routes defined in YAML and PHP format. If you
     define routes in XML and/or PHP formats, you need to
     :ref:`update the src/Kernel.php file <configuration-formats>`.