Add documentation for Test::Omnibus::UpdateFromPrevious scenario
What does this MR do and why?
Adding documentation for Test::Omnibus::UpdateFromPrevious
scenario. Also fixing docs lint issues.
Related issue https://gitlab.com/gitlab-org/quality/quality-engineering/team-tasks/-/issues/1529
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.