Merge branch 'jnutt/csv-doc-updates' into 'master'

Update CSV UCM documentation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184393



Merged-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Reviewed-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: James Nutt <jnutt@gitlab.com>