[SecurityBundle] Request is stateless when firewall is stateless

Author: alamirault

reference/configuration/security.rst

@@ -937,6 +937,12 @@ the session must not be used when authenticating users:
             // ...
         };
 
+Routes under this firewall will be :ref:`configured stateless <stateless-routing>`.
+
+.. versionadded:: 6.3
+
+    Stateless firewall marking routes stateless was introduced in Symfony 6.3.
+
 User Checkers
 ~~~~~~~~~~~~~