Merge pull request #28025 from Priyankasaggu11929/patch-1

fix the `kubelet-config-1.21` configmap key value from `config` to `kubelet`

Author: k8s-ci-robot

content/en/docs/tasks/administer-cluster/kubeadm/kubeadm-certs.md

@@ -229,7 +229,7 @@ serverTLSBootstrap: true
 
 If you have already created the cluster you must adapt it by doing the following:
  - Find and edit the `kubelet-config-{{< skew latestVersion >}}` ConfigMap in the `kube-system` namespace.
-In that ConfigMap, the `config` key has a
+In that ConfigMap, the `kubelet` key has a
 [KubeletConfiguration](/docs/reference/config-api/kubelet-config.v1beta1/#kubelet-config-k8s-io-v1beta1-KubeletConfiguration)
 document as its value. Edit the KubeletConfiguration document to set `serverTLSBootstrap: true`.
 - On each node, add the `serverTLSBootstrap: true` field in `/var/lib/kubelet/config.yaml`