HotChocolate 13.9 with AspNet Core 8 documentation needs improvements

[fpiazza99]

Using the tutorials to generate a HotChocolate 13.9 with AspNet Core 8 test project does not always work.

I found thru many searches that the following addition was needed:

app.MapGraphQL()
.WithOptions(new GraphQLServerOptions() { Tool = { ServeMode = GraphQLToolServeMode.Embedded } });