Revise exercise content for ExpressRoute gateway setup

Updated the exercise details and structure for configuring an ExpressRoute gateway, including tasks and key takeaways.

Author: staleycyn

Instructions/Exercises/M03-Unit 4 Configure an ExpressRoute Gateway.md

@@ -15,20 +15,13 @@ Exercise:
 
 ## Exercise scenario
 
-![Diagram of virtual network gateway.](../media/4-exercise-configure-expressroute-gateway.png)
-
-To connect your Azure virtual network and your on-premises network via ExpressRoute, you must create a virtual network gateway first. A virtual network gateway serves two purposes: to exchange IP routes between the networks and to route network traffic.
+To connect your Azure virtual network and your on-premises network via ExpressRoute, you must create a virtual network gateway first. A virtual network gateway serves two purposes: to exchange IP routes between the networks and to route network traffic. To send network traffic on a private connection, you use the gateway type 'ExpressRoute'. This is also referred to as an ExpressRoute gateway and is the type of gateway used when configuring ExpressRoute.
 
-## Estimated time: 60 minutes (includes ~45 minutes deployment waiting time)
 
-**Gateway types**
-
-When you create a virtual network gateway, you need to specify several settings. One of the required settings, '-GatewayType', specifies whether the gateway is used for ExpressRoute, or VPN traffic. The two gateway types are:
+![Diagram of virtual network gateway.](../media/4-exercise-configure-expressroute-gateway.png)
 
-- **VPN** - To send encrypted traffic across the public Internet, you use the gateway type 'VPN'. This is also referred to as a VPN gateway. Site-to-Site, Point-to-Site, and VNet-to-VNet connections all use a VPN gateway.
-- **ExpressRoute** - To send network traffic on a private connection, you use the gateway type 'ExpressRoute'. This is also referred to as an ExpressRoute gateway and is the type of gateway used when configuring ExpressRoute.
 
-Each virtual network can have only one virtual network gateway per gateway type. For example, you can have one virtual network gateway that uses -GatewayType VPN, and one that uses -GatewayType ExpressRoute.
+## Estimated time: 60 minutes (includes ~45 minutes deployment waiting time
 
 ## Job skills