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

Author: engyebrahim

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

@@ -15,6 +15,7 @@ This guide assists users in upgrading their MSTest projects from MSTest v1 to MS
 ---
 
 ### Who Is Impacted?
+
 This guide is intended for projects currently using MSTest v1 via either:
 - **Assembly references**: Projects referencing `Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll` directly in their project files.
 - **NuGet packages**: Projects using MSTest v1 through the `MSTest.TestFramework` NuGet package.