[BUGFIX] Fix typo in deprecation description

Change-Id: I65952e5c9a745e6bd2f00e7fc9345d8faad1d79c
Releases: 6.2
Related: #47664
Reviewed-on: https://review.typo3.org/20289
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Marc Bastian Heinrichs
Tested-by: Marc Bastian Heinrichs