[BUGFIX] Fix comments in various places

There are some places where phpdoc comments and return types are wrong,
(an IDE shows this ASAP to you if you open up the file).

The patch fixes the small glitches.

Resolves: #85231
Releases: master, 8.7
Change-Id: I3550e7631b31144989d09feee79d1c96da3079db
Reviewed-on: https://review.typo3.org/57195


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>