Update to SPG limitation wording

Author: brittanyrowe

articles/virtual-machine-scale-sets/virtual-machine-scale-sets-attach-detach-vm.md

@@ -140,7 +140,7 @@ Update-AzVM -ResourceGroupName $resourceGroupName -VM $vm  -VirtualMachineScaleS
 - The VM can't be in a `ProximityPlacementGroup`. 
 - The VM can't be in an Azure Dedicated Host. 
 - The VM must have a managed disk. 
-- The VM can't be attached to a scale set with `SinglePlacementGroup` set to true. 
+- The scale set must have `properties.singlePlacementGroup` set to `False`.
 
 ## Detaching a VM from a Virtual Machine Scale Set (Preview)
 Should you need to detach a VM from a scale set, you can follow the below steps to remove the VM from the scale set.