Correct single-step list style

Author: denrea

articles/iot-hub/horizontal-arm-route-messages.md

@@ -40,7 +40,7 @@ Two Azure resources are defined in the template:
 
 This section provides the steps to deploy the ARM template.
 
-1. Create the resources by deploying the ARM template.
+- Create the resources by deploying the ARM template.
 
    [![Deploy To Azure](https://raw.githubusercontent.com/Azure/azure-quickstart-templates/master/1-CONTRIBUTION-GUIDE/images/deploytoazure.svg?sanitize=true)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2FAzure%2Fazure-quickstart-templates%2Fmaster%2Fquickstarts%2Fmicrosoft.devices%2Fiothub-auto-route-messages%2Fazuredeploy.json)