www/53802: Minor name changes to amd64 project page

[Dominic Marks]

Hi,

Just noticed I didn't CC the amd64 list on this PR. Out of interest
should these sorts of things be filed under www or ${ARCH}. Other
observations since I submitted this, NetBSD officially renamed their
port to NetBSD/amd64 which adds a little weight to the direction I've
been seeing in cvs and in general.

Thanks,
-- 
Dominic
 <dom at cus.org.uk> <dominic.marks at npl.co.uk>