[CLEANUP] #4320 Enhance the @var/@param/@return type hinting

Change-Id: I69056e273bc4b448d0ed409185490c3598f71966
Reviewed-on: http://review.typo3.org/35561
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>