accessibility: remove 'Created by' lines

A big Thank You to the original contributors of these ports:

  *  David K. Gerry
  *  Joe Marcus Clarke <marcus@FreeBSD.org>
  *  Koop Mast <kwm@FreeBSD.org>
  *  Mark Felder <feld@FreeBSD.org>
  *  Maxim Sobolev <sobomax@FreeBSD.org>
  *  Michael Johnson <ahze@FreeBSD.org>
  *  Piotr Kubaj <pkubaj@anongoth.pl>

With hat:	portmgr