[coreutils] Project web page mailing list information updated.

[Bob Proulx]

Peng Yu pointed out that the mailing list information on the project
web page didn't mention this mailing list!

I just updated the mailing information there.

  http://www.gnu.org/software/coreutils/

I didn't mention coreutils-patches at all.  But I also don't think a
canonical process for dealing with patches has really settled out yet
either.  Should mention of sending patches to coreutils-patches be
added?  I am ambivalent.

I wrote that requests for new features should go here to the coreutils
list.  I think that is best for an initial contact.  After
consideration the issue can be filed and tracked in the tracker at
bug-coreutils.  However feel free to disagree with that process.
Before with only the one mailing list the protocol was simple and the
web documentation didn't differentiate.  But I think bringing up the
discussion first makes the most sense.

Bob