doc: add_host: add example without deprecated vars (#5323)

ansible_ssh_* are deprecated since 2.0

lib/ansible/modules/inventory/add_host.py

@@ -49,8 +49,13 @@ EXAMPLES = '''
 # add a host with a non-standard port local to your machines
 - add_host: name={{ new_ip }}:{{ new_port }}
 
-# add a host alias that we reach through a tunnel
+# add a host alias that we reach through a tunnel (Ansible <= 1.9)
 - add_host: hostname={{ new_ip }}
             ansible_ssh_host={{ inventory_hostname }}
             ansible_ssh_port={{ new_port }}
+
+# add a host alias that we reach through a tunnel (Ansible >= 2.0)
+- add_host: hostname={{ new_ip }}
+            ansible_host={{ inventory_hostname }}
+            ansible_port={{ new_port }}
 '''