Documentation is unclear about what a reviewer state property is about

Problem to solve

There doesn't seem to be any documentation about what the state property of a reviewer is about, in the "Get single merge request reviewers" paragraph.

Further details

I took the assumption that a reviewer that was in "state": "reviewed" had either posted a comment or a thread, or had approved the MR, and that one in "state": "unreviewed" had just not interacted with the MR. It appears not, as posting comments or theads, or approving an MR, might not make a reviewer have the "state": "reviewed" property.

So I am wondering, what is this property for?

Proposal

Provide documentation about what the state property of the GET /projects/:id/merge_requests/:merge_request_iid/reviewers endpoint is about.