Update Azure application gateway exercise instructions

Added a diagram and rephrased instructions for clarity.

Author: staleycyn

Instructions/Exercises/M05-Unit 4 Deploy Azure application gateway.md

@@ -17,17 +17,19 @@ Exercise:
 
 In this exercise, you use the Azure portal to create an application gateway. Then you test it to make sure it works correctly.
 
-![Diagram of application gateway architecture.](../media/4-exercise-deploy-azure-application-gateway.png)
-
-## Estimated time: 25 minutes
-
 The application gateway directs application web traffic to specific resources in a backend pool. You assign listeners to ports, create rules, and add resources to a backend pool. For the sake of simplicity, this article uses a simple setup with a public front-end IP, a basic listener to host a single site on the application gateway, a basic request routing rule, and two virtual machines in the backend pool.
 
 For Azure to communicate between the resources that you create, it needs a virtual network. You can either create a new virtual network or use an existing one. In this example, you'll create a new virtual network while you create the application gateway. Application Gateway instances are created in separate subnets. You create two subnets in this example: one for the application gateway, and another for the backend servers.
 
+
+![Diagram of application gateway architecture.](../media/4-exercise-deploy-azure-application-gateway.png)
+
+
+## Estimated time: 25 minutes
+
 ## Job skills
 
-In this exercise, you will:
+In this exercise, you:
 
 + Task 1: Create an application gateway
 + Task 2: Create virtual machines