Wrong nesting of "enable-flag" in Docs

[h3nn3s]

see https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/9.4/Feature-85080-AddPropertyDisableFormElementsAndFinishers.html

[hannesbochmann]

It seems like the whole enabled flag handling is broken at least in TYPO3 12.4. When an element is configured for the enabled checkbox it's state in the FE (checked/not checked) doesn't influence the behavior of the finisher. This is because the path options.enabled in the FormSetup.yml is wrong. It needs to be options.renderingOptions.enabled.

I will provide a PR to fix this issue but I'm not sure if that's the correct way.