Add note to C-core migration about non-ASP.NET Core SDKs (#30415)

Co-authored-by: Rick Anderson <[email protected]>

aspnetcore/grpc/aspnetcore.md

@@ -260,6 +260,7 @@ You can add a gRPC server to non-ASP.NET Core projects with the following projec
 
 The preceding project file:
 
+* Doesn't use `Microsoft.NET.SDK.Web` as the SDK.
 * Adds a framework reference to `Microsoft.AspNetCore.App`.
   * The framework reference allows non-ASP.NET Core apps, such as Windows Services, WPF apps, or WinForms apps to use ASP.NET Core APIs.
   * The app can now use ASP.NET Core APIs to start an ASP.NET Core server.
@@ -268,6 +269,7 @@ The preceding project file:
   * `.proto` file.
 
 For more information about using the `Microsoft.AspNetCore.App` framework reference, see [Use the ASP.NET Core shared framework](xref:fundamentals/target-aspnetcore#use-the-aspnet-core-shared-framework).
+
 ## Integration with ASP.NET Core APIs
 
 gRPC services have full access to the ASP.NET Core features such as [Dependency Injection](xref:fundamentals/dependency-injection) (DI) and [Logging](xref:fundamentals/logging/index). For example, the service implementation can resolve a logger service from the DI container via the constructor:

aspnetcore/grpc/migration.md

@@ -113,6 +113,14 @@ ASP.NET Core [middleware](xref:fundamentals/middleware/index) offers similar fun
 
 For more information on how these features compare to each other, see [gRPC Interceptors versus Middleware](xref:grpc/interceptors#grpc-interceptors-versus-middleware).
 
+## Host gRPC in non-ASP.NET Core projects
+
+A C-core-based server can be added to any project type. gRPC for .NET server requires ASP.NET Core. ASP.NET Core is usually available because the project file specifies `Microsoft.NET.SDK.Web` as the SDK.
+
+A gRPC server can be hosted to non-ASP.NET Core projects by adding `<FrameworkReference Include="Microsoft.AspNetCore.App" />` to a project. The framework reference makes ASP.NET Core APIs available and they can be used to start an ASP.NET Core server.
+
+For more information, see [Host gRPC in non-ASP.NET Core projects](xref:grpc/aspnetcore#host-grpc-in-non-aspnet-core-projects).
+
 ## Additional resources
 
 * <xref:grpc/index>