Updated the global discovery service version

Author: phecke

powerapps-docs/developer/common-data-service/webapi/samples/global-discovery-service-csharp.md

@@ -60,7 +60,7 @@ The sample depends on the `GetInstances` method and the `Instance` class below:
       client.Timeout = new TimeSpan(0, 2, 0);
       client.BaseAddress = new Uri(GlobalDiscoUrl);
 
-      HttpResponseMessage response = client.GetAsync("api/discovery/v1.0/Instances", HttpCompletionOption.ResponseHeadersRead).Result;
+      HttpResponseMessage response = client.GetAsync("api/discovery/v2.0/Instances", HttpCompletionOption.ResponseHeadersRead).Result;
 
 
       if (response.IsSuccessStatusCode)