[DOCS] Correct naming of UI label

The screenshots of the UI shows the word
`Levels` while the text used `Layers`.

Releases: main, 11.5
Resolves: #97613
Change-Id: Ib539d01496d83c6eef65683aeac306302ed5b9f5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74615


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>