minor #40728 [PHPDoc] Fix some union type cases (fancyweb)

This PR was merged into the 4.4 branch.

Discussion
----------

[PHPDoc] Fix some union type cases

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

While working on symfony/symfony#40154, I discovered some PHPDoc issues, I'm going to comment in the review. Upper branches will need some fixes too.

Commits
-------

dd1481642b [PHPDoc] Fix some union type cases

Author: Nyholm

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)
     {