M #-: Add comment about disk structucre

in vCenter monitoring

src/vmm_mad/remotes/lib/vcenter_driver/virtual_machine_monitor/vm_monitor.rb

@@ -275,6 +275,10 @@ module VirtualMachineMonitor
         info_disks.each do |disk|
             next if disk[1].no_exists?
 
+            # disk[0] contains the disk ID in OpenNebula or the disk path if
+            #         there is no corresponding OpenNebula disk
+            # disk[1] contains the vcenter resource corresponding to the VM disk
+
             # Delete special characters
             name = disk[0].gsub(/[^0-9A-Za-z]/, '_')