[Sync EN] ext/dom: Document Dom\Element::$outerHTML property (PHP 8.5) (#5676)

[github-actions]

Commit: https://github.com/php/doc-en/commit/9a5e44a0cadb280477b8341294db85c215eea827
PR: https://github.com/php/doc-en/pull/5676

Fichiers FR à mettre à jour

• reference/dom/dom/dom-element.xml