1. Imported vs registered

The cluster registration feature replaced the feature to import clusters.

This isn't correct, both still exist. Registering means that we tie in closer with the cloud API's and can fully manage a cluster such as EKS. Importing means taking any generic cluster and adding it to rancher with very basic functionality. I think it would be helpful to list which clusters can be registered: AKS, GKE, EKS. Then maybe k3s....

I'm not sure to what extent k3s is registered, further below we have: "When you delete a cluster that was registered in Rancher, it is disconnected from the Rancher server, but it still exists and you can still access it in the same way you did before it was registered in Rancher.", is that true for k3s ? Reading that sentence, I would assume it means deleting a "registered" k3s cluster in rancher won't delete the underlying cluster, but I doubt that is the behavior. @cwayne18 ? Might need to rethink how we position k3s as a registered cluster.

2. Cluster Type Table

This has a section called: "NON-EKS OR GKE REGISTERED CLUSTERS", which potentially should include AKS. But looking further at that column I don't think it makes sense in general. The only difference between it and "Other" is "Ability to backup and restore Rancher-launched clusters" but if they are registered then they aren't rancher-launched. It also doesn't have clone checked, so maybe there is a difference there, that I'm not sure.