kubeadm: fix typo in control-plane-ip

Author: neolit123

content/en/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm.md

@@ -456,7 +456,7 @@ The output is similar to:
 ```
 
 {{< note >}}
-To specify an IPv6 tuple for `<control-plane-host>:<control-plane-ip>`, IPv6 address must be enclosed in square brackets, for example: `[fd00::101]:2073`.
+To specify an IPv6 tuple for `<control-plane-host>:<control-plane-port>`, IPv6 address must be enclosed in square brackets, for example: `[fd00::101]:2073`.
 {{< /note >}}
 
 The output should look something like: