Merge pull request #30588 from dialogbox/patch-2

Update certificates.md

Author: k8s-ci-robot

content/en/docs/setup/best-practices/certificates.md

@@ -22,6 +22,8 @@ This page explains the certificates that your cluster requires.
 Kubernetes requires PKI for the following operations:
 
 * Client certificates for the kubelet to authenticate to the API server
+* Kubelet [server certificates](/docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/#client-and-serving-certificates)
+  for the the API server to talk to the kubelets
 * Server certificate for the API server endpoint
 * Client certificates for administrators of the cluster to authenticate to the API server
 * Client certificates for the API server to talk to the kubelets