Document quick move command behaviour

Warn a user to be mindful when moving an issue
to a project with different access rules.

doc/user/project/issues/managing_issues.md

@@ -300,6 +300,8 @@ When you move an issue, it's closed and copied to the target project.
 The original issue is not deleted. A system note, which indicates
 where it came from and went to, is added to both issues.
 
+Be careful when moving an issue to a project with different access rules. Before moving the issue, make sure it does not contain sensitive data.
+
 Prerequisites:
 
 - You must have at least the [Reporter role](../../permissions.md) for the project.

doc/user/project/quick_actions.md

@@ -78,7 +78,7 @@ threads. Some quick actions might not be available to all subscription tiers.
 | `/lock`                                                                                          | **{check-circle}** Yes | **{check-circle}** Yes | **{dotted-circle}** No | Lock the discussions.                                                                                                                                                                                                                                                                                                                                                                                                                                     |
 | `/merge`                                                                                         | **{dotted-circle}** No | **{check-circle}** Yes | **{dotted-circle}** No | Merge changes. Depending on the project setting, this may be [when the pipeline succeeds](merge_requests/merge_when_pipeline_succeeds.md), or adding to a [Merge Train](../../ci/pipelines/merge_trains.md).                                                                                                                                                                                                                                              |
 | `/milestone %milestone`                                                                          | **{check-circle}** Yes | **{check-circle}** Yes | **{dotted-circle}** No | Set milestone.                                                                                                                                                                                                                                                                                                                                                                                                                                            |
-| `/move <path/to/project>`                                                                        | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Move this issue to another project.                                                                                                                                                                                                                                                                                                                                                                                                                       |
+| `/move <path/to/project>`                                                                        | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Move this issue to another project. Be careful when moving an issue to a project with different access rules. Before moving the issue, make sure it does not contain sensitive data. |
 | `/parent_epic <epic>`                                                                            | **{dotted-circle}** No | **{dotted-circle}** No | **{check-circle}** Yes | Set parent epic to `<epic>`. The `<epic>` value should be in the format of `&epic`, `group&epic`, or a URL to an epic ([introduced in GitLab 12.1](https://gitlab.com/gitlab-org/gitlab/-/issues/10556)).                                                                                                                                                                                                                                                 |
 | `/promote`                                                                                       | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Promote issue to epic.                                                                                                                                                                                                                                                                                                                                                                                                                                    |
 | `/promote_to_incident`                                                                           | **{check-circle}** Yes | **{dotted-circle}** No | **{dotted-circle}** No | Promote issue to incident ([introduced in GitLab 14.5](https://gitlab.com/gitlab-org/gitlab/-/issues/296787)).                                                                                                                                                                                                                                                                                                                                            |