Finished the docs

Author: javiereguiluz

security/user_checkers.rst

@@ -21,6 +21,8 @@ displayed to the user::
     namespace App\Security;
 
     use App\Entity\User as AppUser;
+    use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+    use Symfony\Component\Security\Core\Exception\AccessDeniedException;
     use Symfony\Component\Security\Core\Exception\AccountExpiredException;
     use Symfony\Component\Security\Core\Exception\CustomUserMessageAccountStatusException;
     use Symfony\Component\Security\Core\User\UserCheckerInterface;
@@ -50,9 +52,17 @@ displayed to the user::
             if ($user->isExpired()) {
                 throw new AccountExpiredException('...');
             }
+
+            if (!\in_array('foo', $token->getRoleNames())) {
+                throw new AccessDeniedException('...');
+            }
         }
     }
 
+.. versionadded:: 7.2
+
+    The ``token`` argument for the ``checkPostAuth()`` method was introduced in Symfony 7.2.
+
 Enabling the Custom User Checker
 --------------------------------