Update unit-testing-mstest-migration-from-v1-to-v3.md

Author: engyebrahim

docs/core/testing/unit-testing-mstest-migration-from-v1-to-v3.md

@@ -255,7 +255,7 @@ Review deprecated attributes, such as `[DeploymentItem]`, and replace them with
 
 ## Code Analyzers and Best Practices
 
-MSTest v3 includes built-in code analyzers for best practices, avoiding configuration pitfalls, and proper use of MSTest attributes and settings.
+MSTest v3 includes built-in code analyzers for best practices, avoiding configuration pitfalls, and proper use of MSTest attributes and settings. This is automatically available when using MSTest package or MSTest.Sdk.
 
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