[Doc]: Get-AzVmSize is not properly working for newer VM-series - this should be added to the docs

### Type of issue

Missing information

### Feedback

The Cmdlet "Get-AzVmSize" has wrong data disk information for newer v6 series VM SKUs.

This could be reproduced with this code snippet:

Get-AzVMSize -Location "westeurope" | Where-Object {($_.Name -like "*ds_v6") -and ($_.ResourceDiskSizeInMb -eq 0)} | Select-Object Name,ResourceDiskSizeInMB

ResourceDiskSizeInMB will be 0, although these VMs have a data disk (larger than 0).

The Cmdlet is using this API:

https://management.azure.com/subscriptions/{subscriptionId}/providers/Microsoft.Compute/locations/{location}/vmSizes

According to the API docs (found here: https://learn.microsoft.com/en-us/rest/api/compute/virtual-machine-sizes/list?view=rest-compute-2024-11-04&tabs=HTTP) the API is deprecated. This will be the reason why it does not work with latest SKUs.

Please add a hint to the docs that:

- The Cmdlet will not work correctly with latest VM skus
- One should use Get-AzComputeResourceSku instead as it uses a newer API

### Page URL

https://learn.microsoft.com/en-us/powershell/module/az.compute/get-azvmsize?view=azps-13.3.0

### Content source URL

https://github.com/Azure/azure-powershell/blob/main/src/Compute/Compute/help/Get-AzVMSize.md

### Author

@mikefrobbins

### Document Id

9c12b5d4-2e9e-4170-f45b-5e3b136c607f