Notify deletion of Kubelet bootstrap token

Kubeadm deletes the file `/etc/kubernetes/bootstrap-kubelet.conf` as per kubernetes/kubernetes#80676

Author: chirangaalwis

content/en/docs/setup/production-environment/tools/kubeadm/kubelet-integration.md

@@ -151,8 +151,10 @@ systemctl daemon-reload && systemctl restart kubelet
 After the kubelet loads the new configuration, kubeadm writes the
 `/etc/kubernetes/bootstrap-kubelet.conf` KubeConfig file, which contains a CA certificate and Bootstrap
 Token. These are used by the kubelet to perform the TLS Bootstrap and obtain a unique
-credential, which is stored in `/etc/kubernetes/kubelet.conf`. When this file is written, the kubelet
-has finished performing the TLS Bootstrap.
+credential, which is stored in `/etc/kubernetes/kubelet.conf`.
+
+When the `/etc/kubernetes/kubelet.conf` file is written, the kubelet has finished performing the TLS Bootstrap.
+Kubeadm deletes the `/etc/kubernetes/bootstrap-kubelet.conf` file after completing the TLS Bootstrap.
 
 ##  The kubelet drop-in file for systemd