[Doc] Fix references to Symfony 2.0

doc/providers/service_controller.rst

@@ -78,7 +78,7 @@ tested/specced. You may also notice that the only external dependency is on
 ``Symfony\Component\HttpFoundation\JsonResponse``, meaning this controller could
 easily be used in a Symfony (full stack) application, or potentially with other
 applications or frameworks that know how to handle a `Symfony/HttpFoundation
-<http://symfony.com/doc/2.0/components/http_foundation/introduction.html>`_
+<http://symfony.com/doc/master/components/http_foundation/introduction.html>`_
 ``Response`` object.
 
 .. code-block:: php

doc/providers/validator.rst

@@ -221,4 +221,4 @@ provider and register the messages under the ``validators`` domain::
     );
 
 For more information, consult the `Symfony2 Validation documentation
-<http://symfony.com/doc/2.0/book/validation.html>`_.
+<http://symfony.com/doc/master/book/validation.html>`_.