Docs feedback: Merge train status not defined in docs
<!--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> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=467063) </details> <!--IssueSummary end--> Could a developer define what the gitlab statuses of a merge train are and could be on this page? https://docs.gitlab.com/ee/api/merge_trains.html and https://docs.gitlab.com/ee/ci/pipelines/merge_trains.html I've seen the statuses as: idle, merged and fresh. Are these all of them? Also merged is intuitive, but what does idle and fresh mean?
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