[TASK] Update sysext/install/Check class comment

With the first rewrite of the install tool in
2013, Check.php came with a class comment the
class shouldn't have *any* dependencies at all.

It of course didn't take long until this was
violated. Ten years later, the comment is totally
outdated and adapted with the patch a bit to be
less awkward.

Resolves: #99848
Releases: main
Change-Id: I8d1fd5358c5dbacaa063494cb3d2702aa2bb3142
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77715


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>