[TASK] Clean up NEWS.md for 6.3

Resolves: #59737
Releases: 6.3
Change-Id: I3260bd78ae85af5915c6ef208dc18468b9cc948a
Reviewed-on: https://review.typo3.org/30959
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring