[TASK] Adjust code comment about deprecation of Controller attribute

The `AsController` has been added to v12 next to the
`Controller` attribute. Later has been deprecated in
v13 and will be removed in v14.

Resolves: #104871
Related: #102631
Releases: main
Change-Id: I4cdaff914faaff8f7eb8d4706ec226374c694142
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85972


Reviewed-by: Jochen Roth <rothjochen@gmail.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen Roth <rothjochen@gmail.com>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>