updated root hints file

Randy Bush wrote:

let's face it. we should be looking at the front page
of the <http://iana.org/&gt; site to find root hints. there
we find <Domain Name Services, which seems
to be missing a link to the signed root hints.

iana, could you please fix that? thanks.

Good idea. I had that in mind along with some other changes for later
this quarter, but given the amount of attention this topic is
generating, I'll try to get something up asap.