Merge branch 'chantalskye-update-customer-instructions' into 'master'

Update navigation steps in customers portal instructions

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/137375



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Daphne Kua <dkua@gitlab.com>
Co-authored-by: Chantal Lawrence <clawrence@gitlab.com>