The following document gives us the following example command.

https://access.redhat.com/documentation/us-en/red_hat_openstack_platform/17.1/html/installing_and_managing_red_hat_openstack_platform_with_director/assembly_replacing-controller-nodes#deploying-a-new-controller-node-to-the-overcloud_replacing-controller-nodes
~~~
$ sudo cephadm shell \
  – ceph orch test add controlller-3 <IP_ADDRESS> <LABELS>
~~~

However, this is wrong. "test" should be "host". Therefore, the correct command is:
~~~
$ sudo cephadm shell \
  – ceph orch host add controlller-3 <IP_ADDRESS> <LABELS>
~~~

Additionally, I think it's better to state that this command should be run on a controller node, not the director node.
Other commands should be run on the director node and only this command should be run on a controller node. It's a bit mis-leading.