Revise lab description for DDoS Protection exercise

Updated lab description to focus on configuring DDoS Protection.

Author: staleycyn

Instructions/Exercises/M06-Unit 4 Configure DDoS Protection on a virtual network using the Azure portal.md

@@ -2,16 +2,13 @@
 lab:
   title: M06-Unit 4 Configure DDoS Protection on a virtual network using the Azure
     portal
-  description: Being responsible for Contoso's Network Security team, you are going
-    to run a mock DDoS attack on the virtual network. The following steps walk you
-    through creating a virtual network, configuring DDoS Protection, and creating
-    an attack which you can observe and monitor with the help of telemetry and metrics.
+  description: Configure DDoS Protection. 
   duration: 40 minutes
   level: 400
   islab: true
   primarytopics:
   - Azure
-  - Azure Portal
+  - DDoS Protection
 ---
 
 # M06-Unit 4 Configure DDoS Protection on a virtual network using the Azure portal