Update cdn-pop-locations.md

Author: cynthn

articles/cdn/cdn-pop-locations.md

@@ -6,7 +6,7 @@ author: duongau
 manager: kumud
 ms.assetid: 669ef140-a6dd-4b62-9b9d-3f375a14215e
 ms.service: azure-cdn
-ms.topic: article
+ms.topic: conceptual
 ms.date: 03/20/2024
 ms.author: duau
 ms.custom: references_regions