[DependencyInjection] Fix return type

Author: derrabus

Service/ServiceSubscriberInterface.php

@@ -47,7 +47,7 @@ interface ServiceSubscriberInterface
      *  * ['?Psr\Log\LoggerInterface'] is a shortcut for
      *  * ['Psr\Log\LoggerInterface' => '?Psr\Log\LoggerInterface']
      *
-     * @return array The required service types, optionally keyed by service names
+     * @return string[] The required service types, optionally keyed by service names
      */
     public static function getSubscribedServices();
 }

Service/ServiceSubscriberTrait.php

@@ -24,6 +24,9 @@ trait ServiceSubscriberTrait
     /** @var ContainerInterface */
     protected $container;
 
+    /**
+     * {@inheritdoc}
+     */
     public static function getSubscribedServices(): array
     {
         static $services;