[TASK] Add phpdoc @var for calls to makeInstance()

Resolves: #58459
Related: #50248
Releases: 6.2
Change-Id: I3b72ecd65dff934a4eff10be7cb3c46ded948a34
Reviewed-on: https://review.typo3.org/29815
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn