Update tutorial-site-to-site-portal.md

The following fact should be clearly stated in the doc:

"Note that local network gateway is deployed in Azure only and not on your on-premises."

Author: azarboon

articles/vpn-gateway/tutorial-site-to-site-portal.md

@@ -95,7 +95,7 @@ To see more information about the public IP address object, select the name/IP a
 
 ## <a name="LocalNetworkGateway"></a>Create a local network gateway
 
-The local network gateway is a specific object that represents your on-premises location (the site) for routing purposes. You give the site a name by which Azure can refer to it, and then specify the IP address of the on-premises VPN device to which you create a connection. You also specify the IP address prefixes that are routed through the VPN gateway to the VPN device. The address prefixes you specify are the prefixes located on your on-premises network. If your on-premises network changes or you need to change the public IP address for the VPN device, you can easily update the values later.
+The local network gateway is a specific object that represents your on-premises location (the site) for routing purposes. You give the site a name by which Azure can refer to it, and then specify the IP address of the on-premises VPN device to which you create a connection. You also specify the IP address prefixes that are routed through the VPN gateway to the VPN device. The address prefixes you specify are the prefixes located on your on-premises network. If your on-premises network changes or you need to change the public IP address for the VPN device, you can easily update the values later. Note that local network gateway is deployed in Azure only and not on your on-premises.
 
 Create a local network gateway by using the following values: