Variables page updates to improve technical accuracy
What does this MR do and why?
Per https://gitlab.com/gitlab-com/gitlab-OKRs/-/work_items/7981, our goal is to improve technical accuracy of the CI variables page.
Specific KR task for progress tracking: https://gitlab.com/gitlab-com/gitlab-OKRs/-/issues/8031.
Edited by Jocelyn Eillis