[TASK] Improve tests for rst files

Resolves: #99123
Releases: main
Change-Id: Ib1818cb6b14ccb92d976905be2b1f28bb0305d3b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76669


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>