[BUGFIX] Code example in feature .rst

Releases: master, 8.7
Resolves: #81928
Change-Id: I7dc15a12e54f11630d162e670e04fb793b07aa5f
Reviewed-on: https://review.typo3.org/53554


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