[DOCS] Fix wrong method name in changelog for Ajax API enhancement

Resolves: #102088
Related: #101970
Releases: main
Change-Id: I56c8975956fdc9dcc08a0cd61e283e46530f8033
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81321


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