Fix sub group audit event streaming
## Description
This is an issue to track the fix that's being applied to sub group audit event streaming in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/90771.
The ~"type::bug" is that audit events are not streamed as documented / expected for certain events on groups, sub-groups and projects.
A possible workaround is to view the correct events in [Audit Events](https://docs.gitlab.com/ee/administration/audit_events.html#group-events), however users may not be aware that the streamed data is incorrect.
## Timeline
On `Jun 22, 2022 3:25am UTC` @zhanglinjie created the MR https://gitlab.com/gitlab-org/gitlab/-/merge_requests/90771+.
On `Jul 5, 2022 8:45am UTC` @mwoolf while reviewing the MR marked the bug as ~"severity::1" https://gitlab.com/gitlab-org/gitlab/-/merge_requests/90771#note_1015894389.
## Resolution
1. https://gitlab.com/gitlab-org/gitlab/-/merge_requests/90771+.
1. Update the event stream ~documentation with the before and after %"15.2".
issue