Fix typo in device id for SiS596, and correct name.  Also update URLs for PCI device information.
Fix typo in device id for SiS596, and correct name.  Also update
URLs for PCI device information.

ok krw@, deraadt@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars