Update docs for multiple assignees

Update docs for multiple assignees

changed milestone to %9.2

assigned to @ClemMakesApps

approved this merge request

merged

mentioned in commit 5bf3e7c2

mentioned in merge request !1943 (closed)

@victorwu: This MR doesn't apply cleanly onto 9-2-stable-ee. Could you please fix the conflicts in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1943?

mentioned in commit 289353a9

mentioned in merge request !1946 (merged)

mentioned in commit 9a644c16