Merge branch 'docs-geo-setup-update' into 'master'

Update Geo setup documentation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/128754



Merged-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Ben Prescott_ <bprescott@gitlab.com>
Co-authored-by: Łukasz Korbasiewicz <lkorbasiewicz@gitlab.com>