Replace 2x non-RFC2606 email addresses

Switched docs email domain to avoid a buttload of spam to non-RFC2606
address.

See also: https://github.com/zurb/foundation/pull/4418

Background: http://tools.ietf.org/search/rfc2606
Merge pull request #4473 from petecooper/master

Replace 2x non-RFC2606 email addresses