fix the path of CLI clean up script

Author: juniwang

articles/azure-signalr/signalr-howto-scale-signalr.md

@@ -70,7 +70,7 @@ az signalr update \
 
 Make a note of the actual name generated for the new resource group. You will use that resource group name when you want to delete all group resources.
 
-[!INCLUDE [cli-script-clean-up](../../../includes/cli-script-clean-up.md)]
+[!INCLUDE [cli-script-clean-up](../../includes/cli-script-clean-up.md)]
 
 ## Compare pricing tiers