[TASK] Update the API documentation

Resolves: #63633

Change-Id: I9b72457bf5bec9c4fbe94bf547672ecd9ef8d3bf
Reviewed-on: http://review.typo3.org/35114
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>