[DOCS] Fix PHP code example in changelog

Resolves: #94342
Releases: master, 10.4
Change-Id: Ia3d10d9b934788228ceb7c6ec0d3e1a67474b9f5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69492


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>