fix kube_apiserver_ip/kube_apiserver_port description

inventory/group_vars/all.yml

@@ -123,8 +123,9 @@ peer_with_router: false
 # Warning : enabling router peering will disable calico's default behavior ('node mesh').
 # The subnets of each nodes will be distributed by the datacenter router
 
-# The port the API Server will be listening on.
+# API Server service IP address in Kubernetes internal network.
 kube_apiserver_ip: "{{ kube_service_addresses|ipaddr('net')|ipaddr(1)|ipaddr('address') }}"
+# The port the API Server will be listening on.
 kube_apiserver_port: 443 # (https)
 kube_apiserver_insecure_port: 8080 # (http)
 # local loadbalancer should use this port instead - default to kube_apiserver_port