Correct portcount in storagectl/sata section

In VirtualBox 4.3.20 the following error stops the script:
`VBoxManage: error: Unknown option: --sataportcount`

And the documentation points that the correct syntax is portcount (instead sataportcount)
`VBoxManage storagectl       <uuid|vmname>
                            --name <name>
                            [--add <ide/sata/scsi/floppy>]
                            [--controller <LsiLogic|LSILogicSAS|BusLogic|
                                          IntelAhci|PIIX3|PIIX4|ICH6|I82078>]
                            **[--portcount <1-30>]**
                            [--hostiocache on|off]
                            [--bootable on|off]
                            [--remove]`