Add categories for 0.80 changelog

Summary:
I've added categories for all the entries + sorted them alphabetically.

Changelog:
[Internal] [Changed] -

bypass-github-export-checks

Reviewed By: fabriziocucci

Differential Revision: D77025334

fbshipit-source-id: 4c29bf3fa299078689473d7cf3c7cf8a79f4c097

Author: cortinico