Merge branch 'audit-events' into 'master'

Use sentence case for audit events

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/158996



Merged-by: Illya Klymov <iklymov@gitlab.com>
Approved-by: Elwyn Benson <ebenson@gitlab.com>
Approved-by: Illya Klymov <iklymov@gitlab.com>
Reviewed-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>