* Tweak namespace fetch command
* Update CA certificate rotation task
* Document when to reconfigure cloud-controller-manager for CA rotation
* Assume that Kubernetes is at least v1.13
At the time of writing, the oldest supported version was v1.21
* Wrap page
* All base64 commands need `-w0` argument or else the base64_encoded_ca bash variable will contain space chars (" ") where newlines were
* All sed command are missing final "/" at the end of the expression. Command fails with the following error
```bash
/bin/sed: -e expression #1, char 95: unterminated `s' command
```
- Instead of telling the users to remove the flag, tell them
that they can point to a copy of the new CA for --client-ca-file
--cluster-signing-cert-file that is not in a bundle with the old CA.
- Don't reference the kubeadm issue. If sig-auth has a tracking
issue for --client-ca-file / --cmanual-ca-rotation: adjust note for "--client-ca-file"
- Instead of telling the users to remove the --client-ca-file flag,
tell them that they can point to a copy of the new CA.
Mention the same for --cluster-signing-cert-file.
- Don't reference the kubeadm issue. If sig-auth has a tracking
issue for --client-ca-file / --cluster-signing-cert-file and bundles
we can add that at some point.