added "references_regions" metadata to track region info from include file

Author: GitHubber17

articles/virtual-machines/windows/expand-os-disk.md

@@ -9,7 +9,7 @@ ms.topic: article
 ms.date: 11/02/2021
 ms.author: kirpas
 ms.subservice: disks
-ms.custom: devx-track-azurepowershell, ignite-fall-2021
+ms.custom: devx-track-azurepowershell, references_regions, ignite-fall-2021
 ---
 # How to expand virtual hard disks attached to a Windows virtual machine