Adding 21H2 Inbox App Iso link

Author: dknappettmsft

articles/virtual-desktop/windows-11-language-packs.md

@@ -28,6 +28,7 @@ Before you can add languages to a Windows 11 Enterprise VM, you'll need to have
     - [Windows 11, version 21H2 Language and Optional Features ISO](https://software-download.microsoft.com/download/sg/22000.1.210604-1628.co_release_amd64fre_CLIENT_LOF_PACKAGES_OEM.iso)
     - [Windows 11, version 22H2 Language and Optional Features ISO](https://software-static.download.prss.microsoft.com/dbazure/988969d5-f34g-4e03-ac9d-1f9786c66749/22621.1.220506-1250.ni_release_amd64fre_CLIENT_LOF_PACKAGES_OEM.iso)
   - Inbox Apps ISO:
+    - [Windows 11, version 21H2 Inbox Apps ISO](https://software-download.microsoft.com/download/pr/22000.194.210911-1543.co_release_svc_prod1_amd64fre_InboxApps.iso)
     - [Windows 11, version 22H2 Inbox Apps ISO](https://software-static.download.prss.microsoft.com/dbazure/988969d5-f34g-4e03-ac9d-1f9786c66749/22621.1.220506-1250.ni_release_amd64fre_InboxApps.iso)
 - An Azure Files share or a file share on a Windows File Server VM