minor #13821 Update firewall.rst (atailouloute)

This PR was merged into the 3.4 branch.

Discussion
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Update firewall.rst

Commits
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fbcb111 Update firewall.rst

Author: javiereguiluz

components/security/firewall.rst

@@ -100,7 +100,7 @@ entry point and access denied URL, is provided by instances of the
 :class:`Symfony\\Bundle\\SecurityBundle\\Security\\FirewallConfig` class.
 
 This object can be accessed through the ``getFirewallConfig(Request $request)``
-method of the :class:`Symfony\\Component\\Security\\Http\\FirewallMap` class and
+method of the :class:`Symfony\\Bundle\\SecurityBundle\\Security\\FirewallMap` class and
 through the ``getConfig()``  method of the
 :class:`Symfony\\Bundle\\SecurityBundle\\Security\\FirewallContext` class.