minor #18931 [Security] Mention customizing successful and failed authentication (alexandre-daubois)

This PR was merged into the 5.4 branch.

Discussion
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[Security] Mention customizing successful and failed authentication

Fix #4258, part of #15908

Commits
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3526742 [Security] Mention customizing successful and failed authentication

Author: javiereguiluz

security.rst

@@ -1608,6 +1608,20 @@ and set the ``limiter`` option to its service ID:
             ;
         };
 
+Customize Successful and Failed Authentication Behavior
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you want to customize the success or failure handling process, instead of
+overwriting the respective listeners globally, you can set custom success
+failure handlers by implementing the
+:class:`Symfony\\Component\\Security\\Http\\Authentication\\AuthenticationSuccessHandlerInterface`
+or the
+:class:`Symfony\\Component\\Security\\Http\\Authentication\\AuthenticationFailureHandlerInterface`.
+
+If you want more information about this, you can have a look at the section
+about
+:ref:`customizing your success handler <login-link_customize-success-handler>`.
+
 .. _security-logging-out:
 
 Logging Out

security/login_link.rst

@@ -693,6 +693,8 @@ from the first hash value and the ``kernel.secret`` container parameter. This
 allows Symfony to sign this final hash, which is contained in the login URL.
 The final hash is also a Base64 encoded SHA-256 hash.
 
+.. _login-link_customize-success-handler:
+
 Customizing the Success Handler
 -------------------------------