Update lab scenario 5 introduction

Author: feaselkl

docs/05_fix_performance_issue/05_fix_performance_issue.md

@@ -9,10 +9,7 @@ has_children: true
 
 ## Lab Scenario
 
-TODO
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-(04)
-Repository security is something development teams may overlook. In this exercise, you will make use of several capabilities GitHub has to secure existing repositories. You will protect important branches, preventing users from checking directly into branches like `main`. Instead, developers will create feature branches and build pull requests that team members can review before code check-in. You will enable manual gating before deployment to production, adding an additional step for manual checks. You will create a security policy for the repository, providing appropriate contact information in the event that someone finds a security vulnerability in repository code. You will also enable Depandabot alerts and show how to run code scanning workflows using CodeQL. Finally, you will create an outside-in availability test in Application Insights to check whether applications are running as expected.
+Now that Application Insights has been deployed, you can use it to uncover performance issues in the application. This, combined with GitHub Copilot, can be a powerful technique for discovering and correcting performance issues in code. You will then see how to deploy additional resources, such as Azure Cache for Redis, as part of an existing infrastructure as code solution, offering the opportunity to enhance performance through specialized software. Finally, you will ensure that .NET unit tests are running as part of the automated build process.
 
 ## Objectives