Update docs on gitlab-sshd
What does this MR do and why?
gitlab-sshd has been production ready since GitLab 15.1, as GitLab.com has been running with 100% of the Git SSH traffic since June 2022 (gitlab-com/gl-infra&603 (closed)).
Omnibus support was added in GitLab 15.9 (omnibus-gitlab!6446 (merged)), so update the documentation accordingly.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Stan Hu