create-cluster-kubeadm: update notes about flannel (#9793)
* create-cluster-kubeadm: update notes about flannel
Add note that a specific manifest can be used to support
different architectures until version 0.11.0 is released.
* Fix passive voice
Style guide compliance
For `flannel` to work correctly, `--pod-network-cidr=10.244.0.0/16` has to be passed to `kubeadm init`. Note that `flannel` works on `amd64`, `arm`, `arm64` and `ppc64le`. For it to work on a platform other than
`amd64`, you must manually download the manifest and replace `amd64` occurrences with your chosen platform.
For `flannel` to work correctly, you must pass `--pod-network-cidr=10.244.0.0/16` to `kubeadm init`.
Set `/proc/sys/net/bridge/bridge-nf-call-iptables` to `1` by running `sysctl net.bridge.bridge-nf-call-iptables=1`
to pass bridged IPv4 traffic to iptables' chains. This is a requirement for some CNI plugins to work, for more information
@@ -291,6 +290,12 @@ please see [here](https://kubernetes.io/docs/concepts/cluster-administration/net