Update confidential-vm-overview.md

Ultra disks are supported.

Author: linuxelf001

articles/confidential-computing/confidential-vm-overview.md

@@ -123,7 +123,6 @@ Confidential VMs *don't support*:
 - Microsoft Azure Virtual Machine Scale Sets with Confidential OS disk encryption enabled
 - Limited Azure Compute Gallery support
 - Shared disks
-- Ultra disks
 - Accelerated Networking
 - Live migration
 - Screenshots under boot diagnostics