Apply suggestions from code review

Co-authored-by: Mike Kistler <[email protected]>

Author: Rick-Anderson

aspnetcore/fundamentals/minimal-apis/responses.md

@@ -138,7 +138,7 @@ The [TypedResults](xref:Microsoft.AspNetCore.Http.TypedResults) class has a stat
 
 The following example illustrates how to use the `TypedResults.ServerSentEvents` API to return a stream of heart rate events as JSON objects to the client:
 
-:::code language="csharp" source="~/fundamentals/minimal-apis/10.0-samples/MinimalServerSentEvents/Program.cs" id="snippet_json" :::
+:::code language="csharp" source="~/fundamentals/minimal-apis/10.0-samples/MinimalServerSentEvents/Program.cs" id="snippet_item" :::
 
 For more information, see the [Minimal API sample app](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/minimal-apis/10.0-samples/MinimalServerSentEvents/Program.cs) using the `TypedResults.ServerSentEvents` API to return a stream of heart rate events as string, `ServerSentEvents`, and JSON objects to the client.