Merge branch 'docs-admin-area-naming-bulk-update' into 'master'

Standardize bold for Admin area in docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/160690



Merged-by: Suzanne Selhorn <sselhorn@gitlab.com>
Approved-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Co-authored-by: Marcel Amirault <mamirault@gitlab.com>