update scale link

Author: aimee-littleton

articles/virtual-network/nat-gateway/nat-metrics.md

@@ -240,7 +240,7 @@ To create the alert, use the following steps:
 
 5. From the **Aggregation type** drop-down menu, select **Total**. 
 
-6. In the **Threshold value** box, enter a percentage value that the Total SNAT connection count must drop below before an alert is fired. When deciding what threshold value to use, keep in mind how much you've scaled out your NAT gateway outbound connectivity with public IP addresses. For more information, see [Scale NAT gateway](./nat-gateway-resource.md#scale-nat-gateway). 
+6. In the **Threshold value** box, enter a percentage value that the Total SNAT connection count must drop below before an alert is fired. When deciding what threshold value to use, keep in mind how much you've scaled out your NAT gateway outbound connectivity with public IP addresses. For more information, see [Scale NAT gateway](./nat-gateway-resource.md#scalability). 
 
 7. From the **Unit** drop-down menu, select **Count**.