[BUGFIX] Remove outdated comment regarding `capitalWords` in `f:format.case`

Resolves: #103142
Releases: main, 12.4, 11.5
Change-Id: I31e5af71aa0e1a9104f8c154a6f0e34f29c90a77
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82983


Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>