Update direct-forwarding.md (dotnet#2431) (dotnet#2432)

remove duplicate code in snippet

Co-authored-by: Juergen Gutsch <juergen@gutsch-online.de>

docs/docfx/articles/direct-forwarding.md

@@ -70,13 +70,10 @@ var httpClient = new HttpMessageInvoker(new SocketsHttpHandler()
 
 // Setup our own request transform class
 var transformer = new CustomTransformer(); // or HttpTransformer.Default;
-var requestOptions = new ForwarderRequestConfig { ActivityTimeout = TimeSpan.FromSeconds(100) };
+var requestConfig = new ForwarderRequestConfig { ActivityTimeout = TimeSpan.FromSeconds(100) };
 
 app.UseRouting();
 
-var transformer = new CustomTransformer(); // or HttpTransformer.Default;
-var requestConfig = new ForwarderRequestConfig { ActivityTimeout = TimeSpan.FromSeconds(100) };
-
 // When using IHttpForwarder for direct forwarding you are responsible for routing, destination discovery, load balancing, affinity, etc..
 // For an alternate example that includes those features see BasicYarpSample.
 app.Map("/test/{**catch-all}", async (HttpContext httpContext, IHttpForwarder forwarder) =>