[BUGFIX] fixes little typo in TypoScript example

Resolves: #59115
Change-Id: I3ce320cc2e14844195bbcb58f54d3d4fae3d1885
Reviewed-on: https://review.typo3.org/30394
Reviewed-by: Peter Kraume
Tested-by: Peter Kraume
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer