[TASK] Update NEWS.md for system categories

The following changes to system categories should be mentioned
in NEWS.md:

* activation by default on pages and tt_content tables
* new menu types for categories-based menus

Resolves: #54368
Releases: 6.2
Change-Id: I1ca95ea6354f52a68bd31cf284d6a103563190a4
Reviewed-on: https://review.typo3.org/26362
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel