• Rename x86-64.sgml to amd64.sgml (no repo copy since there isn't much interesting history to save).
• Update the status of the FreeBSD/amd64 port.
• Sort the platform list alphabetically.
• Add dummy redirect page from x86-64.sgml to amd64.sgml. [1]

Not objected to by: -www [1]
Reviewed by: obrien (current FreeBSD/amd64 port status)
Approved by: ceri (mentor)