Simplify lab description for Azure Front Door setup

Updated the lab description to be more concise.

Author: staleycyn

Instructions/Exercises/M05-Unit 6 Create a front door for a highly available web application using the Azure portal.md

@@ -2,19 +2,13 @@
 lab:
   title: M05-Unit 6 Create a Front Door for a highly available web application using
     the Azure portal
-  description: 'In this exercise, you will set up an Azure Front Door configuration
-    that pools two instances of a web application that runs in different Azure regions.
-    This configuration directs traffic to the nearest site that runs the application.
-    Azure Front Door continuously monitors the web application. You will demonstrate
-    automatic failover to the next available site when the nearest site is unavailable.
-    The network configuration is shown in the following diagram:'
+  description: Create and configure Azure Front Door. 
   duration: 30 minutes
   level: 300
   islab: true
   primarytopics:
   - Azure
   - Azure Front Door
-  - Azure Portal
 ---
 
 # M05-Unit 6 Create a Front Door for a highly available web application using the Azure portal