Update security.rst

Co-authored-by: Wouter de Jong <[email protected]>

security.rst

@@ -1847,11 +1847,8 @@ To enable logging out, activate the  ``logout`` config parameter under your fire
 Symfony will then un-authenticate users navigating to the configured ``path``,
 and redirect them to the configured ``target``.
 
-If your project uses :ref:`Symfony Flex <symfony-flex>`, you're all set:
-the :class:`Symfony\\Bundle\\SecurityBundle\\Routing\\LogoutRouteLoader` will
-automatically register a route for every logout URI you configured!
-Otherwise, you can enable this behavior yourself by importing the
-``security.route_loader.logout`` service as a routing resource:
+If your project does not use :ref:`Symfony Flex <symfony-flex>`, make sure
+you have imported the logout route loader in your routes:
 
 .. configuration-block::