[CLEANUP] Wrong phpdoc in EnableFileService

Fixing a wrong phpdoc comment in EnableFileService

Resolves: #57226
Releases: 6.2
Change-Id: I3531960084bd950f5803bc2212ac36037558cbe3
Reviewed-on: https://review.typo3.org/28693
Reviewed-by: Markus Klein
Tested-by: Markus Klein