Document redaction of Status Page incidents

doc/user/project/status_page/index.md

@@ -83,6 +83,8 @@ The incident detail page shows detailed information about a particular incident.
 To publish an Incident, you first need to create an issue in the Project you enabled the Status Page settings in.
 
 Once this issue is created, a background worker will publish the issue onto the Status Page using the credentials you provided during setup.
+Since all incidents are published publicly, user and group mentions are anonymized with `Incident Responder`,
+and titles of non-public [GitLab references](../../markdown.md#special-gitlab-references) are removed.
 
 NOTE: **Note:**
 Confidential issues are not published. If a published issue is made confidential it will be unpublished.