[CLEANUP] \TYPO3\CMS\Lowlevel\Utility\ArrayBrowser

Cleanup \TYPO3\CMS\Lowlevel\Utility\ArrayBrowser

* phpDoc
* delete unused var
* remove unneeded fully qualified class names

Change-Id: Iced2fd79272a5142a7dd27d78c12a97f33b408d4
Resolves: #64765
Releases: master
Reviewed-on: http://review.typo3.org/36604


Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Göran Bodenschatz <coding@46halbe.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>