[TASK] Enhance documentation for integration of html-sanitizer

... follow-up ...

Resolves: #94797
Releases: master
Change-Id: I8fedbf9ed7e67bf6db7d248680c9844b1a8c6b76
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70446


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>