Revise lab description and primary topics

Updated the lab description and primary topics for clarity.

Author: staleycyn

Instructions/Exercises/M04-Unit 6 Create a Traffic Manager profile using the Azure portal.md

@@ -1,14 +1,13 @@
 ---
 lab:
   title: M04-Unit 6 Create a Traffic Manager profile using the Azure portal
-  description: In this exercise, you will create a Traffic Manager profile to deliver
-    high availability for the fictional Contoso Ltd organization's web application.
+  description: Create and configure a Traffic Manager
   duration: 35 minutes
   level: 300
   islab: true
   primarytopics:
   - Azure
-  - Azure Portal
+  - Traffic Manager
 ---
 
 # M04-Unit 6 Create a Traffic Manager profile using the Azure portal