Fix example for the 'address' element.

Fix example for the 'address' element.

From http://reference.sitepoint.com/html/address:
  The address  element isn’t used for the purpose that you may
  expect—that being to mark up a physical location alone. Instead, it’s
  used to indicate the contact point for the document in which it
  appears. This element would usually appear in a header or footer on
  the page.