Merge branch 'mb-deploy-token-no-ssh' into 'master'

Update deploy token doc to explicitly mention SSH is not supported

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/155158



Merged-by: Phillip Wells <pwells@gitlab.com>
Approved-by: Phillip Wells <pwells@gitlab.com>
Co-authored-by: Matthew Badeau <mbadeau@gitlab.com>