[CLEANUP] Add phpDoc to properties in ext:backend/Controller classes

Resolves: #62634
Releases: master
Change-Id: Iece95781c1c0b1d50364f308d1aabb1ac0f0ec85
Reviewed-on: http://review.typo3.org/33729
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>