Update Strategy.php

Allow strategy to return null as a result of not applied strategy

Author: iNviNho

src/Extracting/Strategies/Strategy.php

@@ -34,7 +34,7 @@ public function __construct(string $stage, DocumentationConfig $config)
      *
      * @throws \Exception
      *
-     * @return array
+     * @return array|null
      */
     abstract public function __invoke(Route $route, ReflectionClass $controller, ReflectionMethod $method, array $routeRules, array $context = []);
 }