[BUGFIX] Fix typos in comment (method header)

This patch fixes two minor typos in the method description (comment)
in class TYPO3\CMS\Extbase\Persistence\Generic\Query.php for method
logicalAnd().

Change-Id: I4bad1d06bc85a0ccdb8b34f0454957946e07991d
Resolves: #61569
Releases: 6.3, 6.2
Reviewed-on: http://review.typo3.org/32755
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>