Add docs section on `provider` field in SSO connectors (#7339)
Add docs section on `provider` field in SSO connectors (#7339)

This adds a section to the SSO docs describing the (currently 3)
possible values for the `provider` field in SSO connectors and
provides links to details where available (ADFS and NetIQ).
gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport