[Routing] Fix some internal references links

Author: javiereguiluz

routing.rst

@@ -873,12 +873,13 @@ Special Parameters
 In addition to your own parameters, routes can include any of the following
 special parameters created by Symfony:
 
+.. _routing-format-parameter:
+.. _routing-locale-parameter:
+
 ``_controller``
     This parameter is used to determine which controller and action is executed
     when the route is matched.
 
-.. _routing-format-parameter:
-
 ``_format``
     The matched value is used to set the "request format" of the ``Request`` object.
     This is used for such things as setting the ``Content-Type`` of the response
@@ -888,8 +889,6 @@ special parameters created by Symfony:
     Used to set the fragment identifier, which is the optional last part of a URL that
     starts with a ``#`` character and is used to identify a portion of a document.
 
-.. _routing-locale-parameter:
-
 ``_locale``
     Used to set the :ref:`locale <translation-locale-url>` on the request.