vSphere out of tree docs need update

[abonillabeeche]

Summary

https://ranchermanager.docs.rancher.com/how-to-guides/new-user-guides/kubernetes-clusters-in-rancher-setup/set-up-cloud-providers/configure-out-of-tree-vsphere

Individual chart installation is not necessary for RKE2, only RKE(1) and RKE2 cluster just need the credentials set in the AddOn section.