Merge branch 'jh-clarify-issue_email_participants' into 'master'

Document invite_email quickaction as being unavailable in templates

See merge request gitlab-org/gitlab!66383

doc/user/project/quick_actions.md

@@ -69,7 +69,7 @@ threads. Some quick actions might not be available to all subscription tiers.
 | `/duplicate <#issue>`                 | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Close this issue and mark as a duplicate of another issue. **(FREE)** Also, mark both as related. |
 | `/epic <epic>`                        | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Add to epic `<epic>`. The `<epic>` value should be in the format of `&epic`, `group&epic`, or a URL to an epic. |
 | `/estimate <time>`                    | **{check-circle}** Yes | **{check-circle}** Yes | **{dotted-circle}** No | Set time estimate. For example, `/estimate 1mo 2w 3d 4h 5m`. Learn more about [time tracking](time_tracking.md). |
-| `/invite_email email1 email2`         | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Add up to six email participants. This action is behind feature flag `issue_email_participants`. |
+| `/invite_email email1 email2`         | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Add up to six email participants. This action is behind feature flag `issue_email_participants` and is not yet supported in issue templates. |
 | `/iteration *iteration:"iteration name"`     | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Set iteration. For example, to set the `Late in July` iteration: `/iteration *iteration:"Late in July"` ([introduced in GitLab 13.1](https://gitlab.com/gitlab-org/gitlab/-/issues/196795)). |
 | `/label ~label1 ~label2`              | **{check-circle}** Yes | **{check-circle}** Yes | **{check-circle}** Yes | Add one or more labels. Label names can also start without a tilde (`~`), but mixed syntax is not supported. |
 | `/lock`                               | **{check-circle}** Yes | **{check-circle}** Yes | **{dotted-circle}** No | Lock the discussions. |