Clarify which features are available with self-hosted Duo
What does this MR do and why?
https://docs.gitlab.com/administration/gitlab_duo_self_hosted/ contains nice tables of features that show which features are supported with Duo Self-Hosted. However, this Duo documentation page contains info that would be misleading or confusing since it doesn't make a distinction about whether GitLab or the user team is hosting Duo.
This attempts to clarify which Duo features are available for GitLab Self-Managed customers that also use Duo Self-Hosted.
References
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