<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=583990) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=583990) </details> <!--IssueSummary end--> Document the offline transfer export REST API endpoints in the GitLab docs. Ensure OpenAPI docs are in line with user-facing documentation. Related: !214719, !216192