Update opentelemetry.cs (#336)

Update ActivitySource name

Author: alexkeh

samples/opentelemetry/opentelemetry.cs

@@ -25,7 +25,7 @@ class ODP_OTel_Demo
  //.AddZipkinExporter() // OpenTelemetry.Exporter.Zipkin NuGet package extension method
  .Build()!;
 
- static ActivitySource activitySource = new ActivitySource("ODPNET");
+ static ActivitySource activitySource = new ActivitySource("ODP.NET App");
 
  static string conString = @"User Id=hr;Password=<PASSWORD>;Data Source=<NET SERVICE NAME>;";