Updated ms.subservice for AKS storage articles

Author: MGoedtel

articles/aks/azure-blob-csi.md

@@ -3,6 +3,7 @@ title: Use Container Storage Interface (CSI) driver for Azure Blob storage on Az
 description: Learn how to use the Container Storage Interface (CSI) driver for Azure Blob storage in an Azure Kubernetes Service (AKS) cluster.
 ms.topic: article
 ms.custom: linux-related-content
+ms.subservice: aks-storage
 ms.date: 11/24/2023
 ---