Docs changes

Author: actions-user

docs/configuration.md

@@ -301,7 +301,7 @@ public class GraphQlController :
 
     static JObject? ParseVariables(string? variables)
     {
-        if (variables == null)
+        if (variables is null)
         {
             return null;
         }
@@ -679,14 +679,14 @@ query ($id: ID!)
 //            websocketClient,
 //            response =>
 //            {
-//                if (response == null)
+//                if (response is null)
 //                {
 //                    return;
 //                }
 
 //                Assert.Null(response.Errors);
 
-//                if (response.Data != null)
+//                if (response.Data is not null)
 //                {
 //                    resetEvent.Set();
 //                }