Update lab2.md with exam domains

Author: Admin-01 SecW01

_labs/lab2.md

@@ -1,7 +1,13 @@
-a# Lab 2 - Reviewing and Managing Security Alerts
+## Lab 2 - Reviewing and Managing Security Alerts
 
 Now that we have all of the security feature enabled, let's review the security alerts that have been created and how to manage them.
 
+This lab covers parts of the following exam domains:
+
+Domain 2: Configure and use secret scanning
+Domain 3: Configure and use dependency management
+Domain 4: Configure and use code scanning
+
 ## Exercise 1: Reviewing Dependabot alerts
 
 1. Click the **Security** tab in the repo. This is where you can see and manage all of the security alerts for the repo.