2018-01-11  Bob Duff  <duff@adacore.com>

gcc/ada/

	* doc/gnat_ugn/gnat_utility_programs.rst: Rewrite gnatpp documentation
	to match what the Libadalang-based version does.
	* doc/gnat_ugn/about_this_guide.rst: Update reference.

From-SVN: r256500