Update Get-AzureRmVM.md

Updated the synopsis to point out this cmdlet is for Azure RM vms.

Author: doctordns

azurermps-5.7.0/AzureRM.Compute/Get-AzureRmVM.md

@@ -9,7 +9,7 @@ schema: 2.0.0
 # Get-AzureRmVM
 
 ## SYNOPSIS
-Gets the properties of a virtual machine.
+Gets the properties of an Azure Resource Manager (ARM) virtual machine.
 
 ## SYNTAX