Document for creating k3s cluster with etcd enabled or upgrading existing k3s to etcd.

[developer1622]

Is your feature request related to a problem? Please describe.
It is not a feature, mostly related to documentation, but I need help finding the correct easy doc from the k3s site to install k3s with etcd in 2 nodes or three or more nodes.

Describe the solution you'd like
There is no easy document I can reference to build the K3s cluster, so it would be better to have a document around it for easy installation and commands.

Describe alternatives you've considered
Maybe I am new to this distro or something, unable to make use of doc to install a k3s cluster with three or more VMs

Additional context
Easy document to install k3s with etcd enabled and also converting existing k3s cluster to use etcd. Thank you.

[brandond]

This is covered in the docs already:
https://docs.k3s.io/datastore/ha-embedded#existing-single-node-clusters