remove gateway type reference

Author: duongau

articles/expressroute/expressroute-howto-gateway-migration-portal.md

@@ -13,7 +13,7 @@ ms.author: duau
 
 # Migrate to an availability zone-enabled ExpressRoute virtual network gateway in Azure portal
 
-When creating an ExpressRoute virtual network gateway, you must select a [gateway SKU](expressroute-about-virtual-network-gateways.md#gateway-types). Higher-level SKUs allocate more CPUs and network bandwidth, enabling the gateway to support higher throughput and more reliable connections to the virtual network.
+When creating an ExpressRoute virtual network gateway, you must select a [gateway SKU](expressroute-about-virtual-network-gateways.md). Higher-level SKUs allocate more CPUs and network bandwidth, enabling the gateway to support higher throughput and more reliable connections to the virtual network.
 
 ## Prerequisites