merged branch lyrixx/patch-2 (PR #476)

Commits
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e3c757a6 [Doc] Fixed some missing use statements in the security

Discussion
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[Doc] Fixed some missing use statements in the security

doc/providers/security.rst

@@ -405,6 +405,7 @@ store the users::
     use Symfony\Component\Security\Core\User\UserProviderInterface;
     use Symfony\Component\Security\Core\User\UserInterface;
     use Symfony\Component\Security\Core\User\User;
+    use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
     use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
     use Doctrine\DBAL\Connection;