Update nat-overview.md

udr priority

Author: aimee-littleton

articles/nat-gateway/nat-overview.md

@@ -104,7 +104,7 @@ A NAT gateway doesn't affect the network bandwidth of your compute resources. Le
 * The subnet has a [system default route](/azure/virtual-network/virtual-networks-udr-overview#default) that routes traffic with destination 0.0.0.0/0 to the internet automatically. Once NAT gateway is configured to the subnet, communication from the virtual machines existing in the subnet to the internet will prioritize using the public IP of the NAT gateway.
 
 
-* Presence of User Defined Routes (UDRs) for virtual appliances or a virtual network gateway (VPN Gateway and ExpressRoute) for a subnet's 0.0.0.0/0 traffic causes traffic to route to these services instead of NAT gateway.
+* When you create a user defined route (UDR) in your subnet route table for 0.0.0.0/0 traffic, the default internet path for this traffic is overridden. A UDR that sends 0.0.0.0/0 traffic to a virtual appliance or a virtual network gateway (VPN Gateway and ExpressRoute) as the next hop type instead override NAT gateway connectivity to the internet.
 
 * Outbound connectivity follows this order of precedence among different routing and outbound connectivity methods: