kubeadm: Document new v1beta2 config format (#14607)

Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>

content/en/docs/setup/independent/control-plane-flags.md

@@ -23,7 +23,7 @@ The `extraArgs` field consist of `key: value` pairs. To override a flag for a co
 2.  Add the flags to override to the field.
 
 For more details on each field in the configuration you can navigate to our
-[API reference pages](https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm#ClusterConfiguration).
+[API reference pages](https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2#ClusterConfiguration).
 
 {{% /capture %}}
 
@@ -35,7 +35,7 @@ For details, see the [reference documentation for kube-apiserver](/docs/referenc
 
 Example usage:
 ```yaml
-apiVersion: kubeadm.k8s.io/v1beta1
+apiVersion: kubeadm.k8s.io/v1beta2
 kind: ClusterConfiguration
 kubernetesVersion: v1.13.0
 metadata:
@@ -54,7 +54,7 @@ For details, see the [reference documentation for kube-controller-manager](/docs
 
 Example usage:
 ```yaml
-apiVersion: kubeadm.k8s.io/v1beta1
+apiVersion: kubeadm.k8s.io/v1beta2
 kind: ClusterConfiguration
 kubernetesVersion: v1.13.0
 metadata:
@@ -72,7 +72,7 @@ For details, see the [reference documentation for kube-scheduler](/docs/referenc
 
 Example usage:
 ```yaml
-apiVersion: kubeadm.k8s.io/v1beta1
+apiVersion: kubeadm.k8s.io/v1beta2
 kind: ClusterConfiguration
 kubernetesVersion: v1.13.0
 metadata:

content/en/docs/setup/independent/high-availability.md

@@ -106,7 +106,7 @@ option. Your cluster requirements may need a different configuration.
 
 1.  On the first control plane node, create a configuration file called `kubeadm-config.yaml`:
 
-        apiVersion: kubeadm.k8s.io/v1beta1
+        apiVersion: kubeadm.k8s.io/v1beta2
         kind: ClusterConfiguration
         kubernetesVersion: stable
         controlPlaneEndpoint: "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT"
@@ -231,7 +231,7 @@ in the kubeadm config file.
 
 1.  Create a file called `kubeadm-config.yaml` with the following contents:
 
-        apiVersion: kubeadm.k8s.io/v1beta1
+        apiVersion: kubeadm.k8s.io/v1beta2
         kind: ClusterConfiguration
         kubernetesVersion: stable
         controlPlaneEndpoint: "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT"

content/en/docs/setup/independent/setup-ha-etcd-with-kubeadm.md

@@ -82,7 +82,7 @@ this example.
     HOST=${ETCDHOSTS[$i]}
     NAME=${NAMES[$i]}
     cat << EOF > /tmp/${HOST}/kubeadmcfg.yaml
-    apiVersion: "kubeadm.k8s.io/v1beta1"
+    apiVersion: "kubeadm.k8s.io/v1beta2"
     kind: ClusterConfiguration
     etcd:
         local: