Update vm-vdi.md (#20072)

Update the Azure subheading to better differentiate it and the prior "Turn on nested virtualization on VMware ESXi" subhead.

content/desktop/vm-vdi.md

@@ -33,8 +33,8 @@ Nested virtualization of other hypervisors like Hyper-V inside a vSphere VM [is
 For steps on how to expose hardware-assisted virtualization to the guest OS, [see VMware's documentation](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vm_admin.doc/GUID-2A98801C-68E8-47AF-99ED-00C63E4857F6.html).
 
 
-### Turn on nested virtualization on Microsoft Hyper-V
+### Turn on nested virtualization on an Azure Virtual Machine
 
 Nested virtualization is supported by Microsoft for running Hyper-V inside an Azure VM.
 
-For Azure virtual machines, [check that the VM size chosen supports nested virtualization](https://docs.microsoft.com/en-us/azure/virtual-machines/sizes). Microsoft provides [a helpful list on Azure VM sizes](https://docs.microsoft.com/en-us/azure/virtual-machines/acu) and highlights the sizes that currently support nested virtualization. For internal testing, we used D4s_v5 machines. We recommend this specification or above for optimal performance of Docker Desktop.
+For Azure virtual machines, [check that the VM size chosen supports nested virtualization](https://docs.microsoft.com/en-us/azure/virtual-machines/sizes). Microsoft provides [a helpful list on Azure VM sizes](https://docs.microsoft.com/en-us/azure/virtual-machines/acu) and highlights the sizes that currently support nested virtualization. For internal testing, we used D4s_v5 machines. We recommend this specification or above for optimal performance of Docker Desktop.