Update dns-sdk.md

Author: cynthn

articles/dns/dns-sdk.md

@@ -8,7 +8,7 @@ manager: kumudD
 ms.assetid: eed99b87-f4d4-4fbf-a926-263f7e30b884
 ms.service: azure-dns
 ms.devlang: csharp
-ms.topic: article
+ms.topic: how-to
 ms.date: 11/30/2023
 ms.author: greglin
 ms.custom: devx-track-csharp, devx-track-dotnet