[TASK] Document behaviour of inline parent info in itemsProcFunc

Since #93508 additional information about the
inline parent are available in the $parameters
array of an itemsProcFunc.

Those information are only available in FormEngine
context and not in the DataHandler. This is now
properly documented in the corresponding class.

Resolves: #94290
Related: #93508
Releases: master, 10.4
Change-Id: Id20390b113f1cd9261a2b33413031233524f6623
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69417


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>