Docs: Update links to full docs URLs: 6 - Docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/181204



Merged-by: Michael Belton <mbelton@gitlab.com>
Approved-by: Evan Read <eread@gitlab.com>
Approved-by: Michael Belton <mbelton@gitlab.com>
Co-authored-by: Marcel Amirault <mamirault@gitlab.com>