Revise lab description for clarity and brevity

Updated the description to be more concise while retaining key details about the DNS configuration tasks.

Author: staleycyn

Instructions/Exercises/M01-Unit 6 Configure DNS settings in Azure.md

@@ -1,9 +1,8 @@
 ---
 lab:
   title: M01 - Unit 6 Configure DNS settings in Azure
-  description: In this unit, you will configure DNS name resolution for Contoso Ltd.
-    You will create a private DNS zone named contoso.com, link the VNets for registration
-    and resolution, and then create two virtual machines and test the configuration.
+  description: Create a private DNS zone, link the VNets for registration
+    and resolution, create two virtual machines, and test the resolution.
   duration: 25 minutes
   level: 400
   islab: true