* gnat_ugn/gnat_project_manager.rst,

    * gnat_ugn/gnat_project_manager.rst,
        gnat_ugn/building_executable_programs_with_gnat.rst,
        gnat_ugn/gnat_and_program_execution.rst,
        gnat_ugn/the_gnat_compilation_model.rst,
        gnat_rm/implementation_defined_pragmas.rst,
        gnat_rm/standard_and_implementation_defined_restrictions.rst,
        gnat_ugn.texi, gnat_rm.texi: Update doc.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230538 138bc75d-0d04-0410-961f-82ee72b054a4