Copyright for gtk-doc source package in Huanghe V3.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: gtk-doc
Source: https://download.gnome.org/sources/gtk-doc/

Files: *
Copyright:
 1996 X Consortium
 1998-2001 Damon Chaplin
 1998 Michael Zucchi
 1998 Owen Taylor
 2003 James Henstridge
 2007 David Necas (Yeti)
 2007 David Nečas
 2007-2018 Stefan Sauer
 2009 Rich Wareham
 2015 Christoph Reiter
 2015 Lautsprecher Teufel GmbH
License: GPL-2+

Files:
 m4/ax_python_module.m4
Copyright:
 2008 Andrew Collier
License: autoconf-archive

License: GPL-2+
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 .
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 .
 Please see /usr/share/common-licenses/GPL-2 on a Debian system for the full
 text.

License: autoconf-archive
 Copying and distribution of this file, with or without modification, are
 permitted in any medium without royalty provided the copyright notice
 and this notice are preserved. This file is offered as-is, without any
 warranty.