[FOLLOWUP][FEATURE] Add missing information status for addSystemMessage

Set correct reference to forge issue in rst file.

Resolves: #78103
Releases: master
Change-Id: I80267a5578f5fcfbc914310df965bcdfa57b93b7
Reviewed-on: https://review.typo3.org/50314


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>