[PHPDoc] Fix some union type cases

Author: fancyweb

EventListener/EnvelopeListener.php

@@ -27,8 +27,8 @@ class EnvelopeListener implements EventSubscriberInterface
     private $recipients;
 
     /**
-     * @param Address|string     $sender
-     * @param (Address|string)[] $recipients
+     * @param Address|string        $sender
+     * @param array<Address|string> $recipients
      */
     public function __construct($sender = null, array $recipients = null)
     {