Update doc date

Author: zhenlan

articles/azure-app-configuration/howto-best-practices.md

@@ -9,7 +9,7 @@ editor: ''
 ms.assetid: 
 ms.service: azure-app-configuration
 ms.topic: conceptual
-ms.date: 09/08/2023
+ms.date: 12/21/2023
 ms.author: zhenlwa
 ms.custom: "devx-track-csharp, mvc"
 ---