Docs feedback: Merge train status not defined in docs

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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?