[BUGFIX] Unify version/release in Documentation/Settings.cfg

Resolves: #83480
Releases: master, 8.7, 7.6
Change-Id: I87f3d692b4422b2e998076b2ef09ee65c85b8bba
Reviewed-on: https://review.typo3.org/56476


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>