[commit/doc] Update gpl.texi to GPL v3

[Joel Brobecker]

This is an obvious error where the documention contains version 2
of the GPL when in fact the software has been transition to the GPL
version 3.  Fixed thusly - will also commit to the 7.0 branch
momentarily.

2009-12-20  Joel Brobecker  <brobecker@adacore.com>

        * gpl.texi: Update to version 3 of the GPL.

Verified by rebuilding the PDF and HTML documentation.

-- 
Joel
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