[Update NOTE] Add an API server named certificate 

The NOTE section currently as below:

A new revision of the Kubernetes API server only rolls out if the API server named certificate is added for the first time. When the API server named certificate is renewed, a new revision of the Kubernetes API server does not roll out because the `kube-apiserver` pods dynamically reload the updated certificate.



This should be updated like below:

A new revision of the `kube-apiserver` only rolls out if the API server named certificate is added for the first time. When the API server named certificate is renewed, a new revision of the `kube-apiserver` does not roll out because the `kube-apiserver` pods dynamically reload the updated certificate.



Link: https://docs.openshift.com/container-platform/4.13/security/certificates/api-server.html