[DOCS] Fix syntax of PHP snippets in Changelog entry

Resolves: #96864
Releases: main
Change-Id: If904301349efb7e3308cea787b6fb798a7932d80
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73461


Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>