Doc: add k3s --disable-kube-proxy note
Doc: add k3s --disable-kube-proxy note

If user intend to run Cilium in kube-proxy free mode, add
k3s option --disable-kube-proxy to stop k3s from setting up
iptables rules for cluster services.

Signed-off-by: Vincent Li <01b57b7e95ca95e60832491192e54abc20ed26d5@f5.com>

michi-covalent/cilium,cilium/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium