double http on gnu.org/software/bayonne

Towards the bottom of http://www.gnu.org/software/bayonne/ is this
mistyped link that needs the duplicate host part removed:

   Retrieved from "http://www.gnutelephony.orghttp://www.gnutelephony.org/index.php/GNU_Bayonne"

There are some broken images below that, too.

As long as I'm writing, "Introducion" should be "Introduction", too :).

Best,
Karl