Merge branch 'update_detailed_merge_status_docs' into 'master'

Update detailed merge request docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138048



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Marc Shaw <mshaw@gitlab.com>

doc/api/merge_requests.md

@@ -827,6 +827,7 @@ Use `detailed_merge_status` instead of `merge_status` to account for all potenti
   - `not_approved`: Approval is required before merge.
   - `not_open`: The merge request must be open before merge.
   - `policies_denied`: The merge request contains denied policies.
+  - `jira_association_missing`: The title or description must reference a Jira issue.
 
 ### Preparation steps