Update estimated time section in exercise instructions

Added estimated time for the exercise and removed duplicate estimated time section.

Author: staleycyn

Instructions/Exercises/M07-Unit 5 Restrict network access to PaaS resources with virtual network service endpoints.md

@@ -20,6 +20,9 @@ Virtual network service endpoints enable you to limit network access to some Azu
 
 ![Diagram of service endpoint architecture.](../media/5-exercise-restrict-network-paas-resources-virtual-network-service-endpoints.png)
 
+
+## Estimated time: 35 minutes
+
 ## Job skills
 
 In this exercise, you will:
@@ -35,8 +38,6 @@ In this exercise, you will:
 + Task 9: Create virtual machines
 + Task 10: Confirm access to storage account
 
-## Estimated time: 35 minutes
-
 ## Task 1: Create a virtual network
 
 1. Login to the Azure Portal.