Fix some descriptions for kubeadm

from `v1alpha1` to `v1alpha2`.

CHANGELOG-1.11.md

@@ -287,7 +287,7 @@ or `/etc/sysconfig/kubelet`, depending on the system you're running on.
 * As a reminder, etcd2 as a backend is deprecated and support will be removed in Kubernetes 1.13. Please ensure that your clusters are upgraded to etcd3 as soon as possible.
 * InfluxDB cluster monitoring has been deprecated as part of the deprecation of Heapster. Instead, you may use the [metrics server](https://github.com/kubernetes-incubator/metrics-server). It's a simplified heapster that is able to gather and serve current metrics values. It provides the Metrics API that is used by `kubectl top`, and horizontal pod autoscaler. Note that it doesn't include some features of Heapster, such as short term metrics for graphs in kube-dashboard and dedicated push sinks, which proved hard to maintain and scale. Clusters using Heapster for transfering metrics into long-term storage should consider using their metric solution's native Kubernetes support, if present, or should consider alternative solutions. ([#62328](https://github.com/kubernetes/kubernetes/pull/62328), [@serathius](https://github.com/serathius))
 * The kubelet `--rotate-certificates` flag is now deprecated, and will be removed in a future release. The kubelet certificate rotation feature can now be enabled via the `.RotateCertificates` field in the kubelet's config file.  ([#63912](https://github.com/kubernetes/kubernetes/pull/63912), [@luxas](https://github.com/luxas))
-* The kubeadm configuration file version has been upgraded from `v1alpha2` from `v1alpha1`. `v1alpha1` read support exists in v1.11, but will be removed in v1.12. ([#63788](https://github.com/kubernetes/kubernetes/pull/63788), [@luxas](https://github.com/luxas))
+* The kubeadm configuration file version has been upgraded from `v1alpha1` to `v1alpha2`. `v1alpha1` read support exists in v1.11, but will be removed in v1.12. ([#63788](https://github.com/kubernetes/kubernetes/pull/63788), [@luxas](https://github.com/luxas))
 The following PRs changed the API spec:
   * In the new v1alpha2 kubeadm Configuration API, the `.CloudProvider` and `.PrivilegedPods` fields don't exist anymore. Instead, you should use the out-of-tree cloud provider implementations, which are beta in v1.11.
   * If you have to use the legacy in-tree cloud providers, you can rearrange your config like the example below. If you need the `cloud-config` file (located in `{cloud-config-path}`), you can mount it into the API Server and controller-manager containers using ExtraVolumes, as in: