[DOCS] Remove namespace within configuration from docs

The vendor namespace TYPO3.CMS.Form is no longer
used in the form configuration. This patch removes
the namespace from snippets within the documentation.

Resolves: #97896
Related: #97517
Releases: main
Change-Id: I52c9c0533d2934781de963209f21d23f1fe9aa2d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75106


Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>