Update access_token.rst

Author: andreybolonin

security/access_token.rst

@@ -78,6 +78,7 @@ This handler must implement
     namespace App\Security;
 
     use App\Repository\AccessTokenRepository;
+    use Symfony\Component\Security\Core\Exception\BadCredentialsException;
     use Symfony\Component\Security\Http\AccessToken\AccessTokenHandlerInterface;
     use Symfony\Component\Security\Http\Authenticator\Passport\Badge\UserBadge;