Update security.rst

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

Author: MatTheCat

security.rst

@@ -1845,7 +1845,8 @@ 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``.
+and redirect them to the configured ``target``. You can generate URLs to this
+path using the ``_security_<firewallname>`` route name (e.g. ``_security_main``).
 
 If your project does not use :ref:`Symfony Flex <symfony-flex>`, make sure
 you have imported the logout route loader in your routes: