Updated 'docs' page on Sourceforge

[Brian Manning <cpan xaoc org>]

Hi all,

I just thought I would let everybody know that the 'perli11ndoc' tool
is now referenced as the primary way to obtain documentation about
Gtk3, as well as any other introspectable GTK+ libraries that are
installed on your system.

I also grouped the documentation by GTK+ version, so that the GTK+3
docs are shown at the top of the page, and the GTK+2 docs are below
them, instead of being mixed in with one another.

You can view the updated 'docs' page on Sourceforge:

http://gtk2-perl.sourceforge.net/doc/

Please let me know if you have any questions, or find any issues with
the HTML/documentation/links.

Thanks,

Brian