Update Troubleshooting etcd Nodes

[mrolmedo]

Summary

Hi team,
Our docs for Troubleshooting etcd Nodes are still referring to docker as runtime, although there are not a references for containerd (RKE2).

It might need to be updated. CF https://gist.github.com/superseb/3b78f47989e0dbc1295486c186e944bf#etcd

Thanks

[Tejeev]

These def need an update (came up with customer today). Our internal troubleshooting page shows some permutations of the commands which may be of use too. https://github.com/rancherlabs/support-kb/wiki/One-Liners#etcd