Acrolinx fix: "multi-tenant" to "multitenant"

Author: denrea

articles/application-gateway/create-url-route-portal.md

@@ -122,7 +122,7 @@ In this example, you create three virtual machines to be used as backend servers
 
 ### Backends tab
 
-The backend pool is used to route requests to the backend servers that serve the request. Backend pools can be composed of NICs, virtual machine scale sets, public IPs, internal IPs, fully qualified domain names (FQDN), and multi-tenant backends like Azure App Service.
+The backend pool is used to route requests to the backend servers that serve the request. Backend pools can be composed of NICs, virtual machine scale sets, public IPs, internal IPs, fully qualified domain names (FQDN), and multitenant backends like Azure App Service.
 
 1. On the **Backends** tab, select **Add a backend pool**.