Update expressroute-howto-add-gateway-portal-resource-manager.md

Syntax update

Author: mialdrid

articles/expressroute/expressroute-howto-add-gateway-portal-resource-manager.md

@@ -58,7 +58,7 @@ The steps for this tutorial use the values in the following configuration refere
 
     :::image type="content" source="./media/expressroute-howto-add-gateway-portal-resource-manager/add-gateway-subnet.png" alt-text="Screenshot that shows the button to add the gateway subnet.":::
 
-1. The **Name** for your subnet is automatically filled in with the value 'GatewaySubnet'. This value is required in order for Azure to recognize the subnet as the gateway subnet. Adjust the autofilled **Address range** values to match your configuration requirements. **You need to create a gateway subnet with a /27 or larger** (/26, /25, and so on.). /28 or smaller subnets are not supported for new deployments. If you plan on connecting 16 ExpressRoute circuits to your gateway, you **must** create a gateway subnet of /26 or larger.
+1. The **Name** for your subnet is automatically filled in with the value 'GatewaySubnet'. This value is required in order for Azure to recognize the subnet as the gateway subnet. Adjust the autofilled **Address range** values to match your configuration requirements. **You need to create the GatewaySubnet with a /27 or larger** (/26, /25, and so on.). /28 or smaller subnets are not supported for new deployments. If you plan on connecting 16 ExpressRoute circuits to your gateway, you **must** create a gateway subnet of /26 or larger.
 
     If you're using a dual stack virtual network and plan to use IPv6-based private peering over ExpressRoute, select **Add IP6 address space** and enter **IPv6 address range** values.