Cleanup more @return annotations

EventDispatcherInterface.php

@@ -48,7 +48,7 @@ public function removeSubscriber(EventSubscriberInterface $subscriber);
     /**
      * Gets the listeners of a specific event or all listeners sorted by descending priority.
      *
-     * @return array The event listeners for the specified event, or all event listeners by event name
+     * @return array<callable[]|callable>
      */
     public function getListeners(string $eventName = null);
 
@@ -57,14 +57,14 @@ public function getListeners(string $eventName = null);
      *
      * Returns null if the event or the listener does not exist.
      *
-     * @return int|null The event listener priority
+     * @return int|null
      */
     public function getListenerPriority(string $eventName, callable $listener);
 
     /**
      * Checks whether an event has any registered listeners.
      *
-     * @return bool true if the specified event has any listeners, false otherwise
+     * @return bool
      */
     public function hasListeners(string $eventName = null);
 }

EventSubscriberInterface.php

@@ -43,7 +43,7 @@ interface EventSubscriberInterface
      * The code must not depend on runtime state as it will only be called at compile time.
      * All logic depending on runtime state must be put into the individual methods handling the events.
      *
-     * @return array<string, mixed> The event names to listen to
+     * @return array<string, (string|list<string,int>|list<list<string,int>>)>
      */
     public static function getSubscribedEvents();
 }

GenericEvent.php

@@ -40,7 +40,7 @@ public function __construct($subject = null, array $arguments = [])
     /**
      * Getter for subject property.
      *
-     * @return mixed The observer subject
+     * @return mixed
      */
     public function getSubject()
     {
@@ -50,7 +50,7 @@ public function getSubject()
     /**
      * Get argument by key.
      *
-     * @return mixed Contents of array key
+     * @return mixed
      *
      * @throws \InvalidArgumentException if key is not found
      */