Update proximity-placement-groups.md

Author: cynthn

articles/virtual-machines/windows/proximity-placement-groups.md

@@ -86,7 +86,7 @@ To remove a VM from a proximity placement group, you need to stop\deallocate the
 $ppg = Get-AzProximityPlacementGroup -ResourceGroupName myPPGResourceGroup -Name myPPG
 $vm = Get-AzVM -ResourceGroupName myResourceGroup -Name myVM
 Stop-AzVM -Name $vm.Name -ResourceGroupName $vm.ResourceGroupName
-$vm.ProximityPlacementGroupId = ""
+$vm.ProximityPlacementGroup = ""
 Update-AzVM -VM $vm -ResourceGroupName $vm.ResourceGroupName 
 Start-AzVM -Name $vm.Name -ResourceGroupName $vm.ResourceGroupName
 ```