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

Author: engyebrahim

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

@@ -75,7 +75,7 @@ For those comfortable editing XML directly, you can manually remove the referenc
 
 You can update your project to MSTest v3 in one of two ways:
 
-- **Install via NuGet Package**: Install the latest [MSTest](https://www.nuget.org/packages/MSTest) package using the NuGet Package Manager in Visual Studio or by running the following command in the NuGet Package Manager Console:
+- **Install via NuGet Package** (for SDK-style projects): Install the latest [MSTest](https://www.nuget.org/packages/MSTest) package using the NuGet Package Manager in Visual Studio or by running the following command in the NuGet Package Manager Console:
 
     ```shell
     Install-Package MSTest-Version 3.6.2