Ring hash can only be used from within xds currently, because that's the only way to get a hash assigned to RPCs which is required for it to function. So it should be using the _experimental suffix like the other only-used-from-xds policies. The gRFC uses both names for the policy, but one is more vernacular and the other is the precise name as seen in the LB registry. I confirmed with @markdroth that _experimental is intended.

We would be interested in figuring out a way to use it outside of xds, but there's currently no work happening on that front.