minor #6127 escape namespace backslashes in class role (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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escape namespace backslashes in class role

Commits
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d9f931a [#5303] escape namespace backslashes in class role

Author: xabbuh

components/security/authentication.rst

@@ -273,14 +273,14 @@ Authentication Events
 
 The security component provides 4 related authentication events:
 
-===============================  ================================================  =========================================================================
+===============================  ================================================  ==============================================================================
 Name                             Event Constant                                    Argument Passed to the Listener
-===============================  ================================================  =========================================================================
-security.authentication.success  ``AuthenticationEvents::AUTHENTICATION_SUCCESS``  :class:`Symfony\Component\Security\Core\Event\AuthenticationEvent`
-security.authentication.failure  ``AuthenticationEvents::AUTHENTICATION_FAILURE``  :class:`Symfony\Component\Security\Core\Event\AuthenticationFailureEvent`
-security.interactive_login       ``SecurityEvents::INTERACTIVE_LOGIN``             :class:`Symfony\Component\Security\Http\Event\InteractiveLoginEvent`
-security.switch_user             ``SecurityEvents::SWITCH_USER``                   :class:`Symfony\Component\Security\Http\Event\SwitchUserEvent`
-===============================  ================================================  =========================================================================
+===============================  ================================================  ==============================================================================
+security.authentication.success  ``AuthenticationEvents::AUTHENTICATION_SUCCESS``  :class:`Symfony\\Component\\Security\\Core\\Event\\AuthenticationEvent`
+security.authentication.failure  ``AuthenticationEvents::AUTHENTICATION_FAILURE``  :class:`Symfony\\Component\\Security\\Core\\Event\\AuthenticationFailureEvent`
+security.interactive_login       ``SecurityEvents::INTERACTIVE_LOGIN``             :class:`Symfony\\Component\\Security\\Http\\Event\\InteractiveLoginEvent`
+security.switch_user             ``SecurityEvents::SWITCH_USER``                   :class:`Symfony\\Component\\Security\\Http\\Event\\SwitchUserEvent`
+===============================  ================================================  ==============================================================================
 
 Authentication Success and Failure Events
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~