Documentation: Add missing admonition type to UniFi docs (#4353)

docs/widgets/info/unifi_controller.md

@@ -7,7 +7,7 @@ _(Find the Unifi Controller service widget [here](../services/unifi-controller.m
 
 You can display general connectivity status from your Unifi (Network) Controller.
 
-!!!
+!!! warning
 
     When authenticating you will want to use a local account that has at least read privileges.
 

docs/widgets/services/unifi-controller.md

@@ -9,7 +9,7 @@ _(Find the Unifi Controller information widget [here](../info/unifi_controller.m
 
 You can display general connectivity status from your Unifi (Network) Controller.
 
-!!!
+!!! warning
 
     When authenticating you will want to use a local account that has at least read privileges.