Add missing unifi fields

Co-Authored-By: JeffRandall <1891490+JeffRandall@users.noreply.github.com>

docs/widgets/services/unifi-controller.md

@@ -11,7 +11,9 @@ You can display general connectivity status from your Unifi (Network) Controller
 
 An optional 'site' parameter can be supplied, if it is not the widget will use the default site for the controller.
 
-Allowed fields: `["uptime", "wan", "lan_users", "wlan_users"]`.
+Allowed fields: `["uptime", "wan", "lan", "lan_users", "lan_devices", "wlan", "wlan_users", "wlan_devices"]` (maximum of four).
+
+Note that fields unsupported by the unifi device will not be shown.
 
 ```yaml
 widget: