PCI: Correct pci=resource_alignment parameter example

The "pci=resource_alignment" parameter is described as requiring an order
(not a size) and the code in pci_specified_resource_alignment() expects an
order.

But the example wrongly shows a size.  Convert the example to an order.

Fixes: 8b078c60 ("PCI: Update "pci=resource_alignment" documentation")
Link: https://lore.kernel.org/r/20190606032557.107542-1-aik@ozlabs.ru


Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>