cleanup: remove 'Created by' lines

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

• Alex Trull <freebsd.alex@trull.org>
• Alonso Cardenas <acm@FreeBSD.org>
• Boris Samorodov <bsam@FreeBSD.org>
• David Shane Holden <dpejesh@yahoo.com>
• Felix Palmen <felix@palmen-it.de>
• Hirohisa Yamaguchi <umq@ueo.co.jp>
• Kevin Bowling <kbowling@FreeBSD.org>
• Mario Sergio Fujikawa Ferreira <lioux@FreeBSD.org>
• Markus Mann, CTS - FreeBSD Team <de-freebsd@ctseuro.com>
• Matthias Andree
• Matthias Fechner <mfechner@FreeBSD.org>
• Oleg Sidorkin <osidorkin@gmail.com>
• Oliver Lehmann
• Radim Kolar <hsn@sendmail.cz>
• Timothy Beyer <beyert@cs.ucr.edu>
• hq@FreeBSD.org
• johalun0@gmail.com
• lev@FreeBSD.org
• rooneg@electricjellyfish.net

With hat: portmgr