[TASK] v7 Changelog: Further fixes and alignments with master

Two fixes in specific .rst files and syncing main Index.rst
and other files on this level with master.

Change-Id: Ibe3221e455bd05fe4417aafab4afeb4c2ba409e4
Resolves: #83362
Releases: 7.6
Reviewed-on: https://review.typo3.org/55126


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>