Revise lab description and change level to 400

Updated lab description and adjusted difficulty level.

Author: staleycyn

Instructions/Exercises/M06-Unit 7 Deploy and configure Azure Firewall using the Azure portal.md

@@ -1,19 +1,13 @@
 ---
 lab:
   title: M06-Unit 7 Deploy and configure Azure Firewall using the Azure portal
-  description: Being part of the Network Security team at Contoso, your next task
-    is to create firewall rules to allow/deny access to certain websites. The following
-    steps walk you through creating a resource group, a virtual network and subnets,
-    and a virtual machine as environment preparation tasks, and then deploying a firewall
-    and firewall policy, configuring default routes and application, network and DNAT
-    rules, and finally testing the firewall.
+  description: Create and configure Azure Firewall. 
   duration: 60 minutes
-  level: 500
+  level: 400
   islab: true
   primarytopics:
   - Azure
   - Azure Firewall
-  - Azure Portal
 ---
 
 # M06-Unit 7 Deploy and configure Azure Firewall using the Azure portal