Merge branch 'cbalane-master-patch-641f' into 'master'

Clarify guest users for GitLab Dedicated in Docs

Closes gitlab-com/gl-infra/gitlab-dedicated/team#3096

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138119



Merged-by: Lysanne Pinto <lpinto@gitlab.com>
Co-authored-by: Hannah Sutor <hsutor@gitlab.com>
Co-authored-by: Chris Balane <cbalane@gitlab.com>