Formatting cleanups in macro comments.

Formatting cleanups in macro comments.

For a list of candidate unaligned underlines, use this script:

for f in `git ls-files`; do
  awk '{ len[NR] = length($0) }
       /----*/ && len[NR-1] != 0 {
         if (len[NR-1] != len[NR])
           print FILENAME ":" NR ":" $0
       }' $f
done

* lib/autoconf/c.m4, lib/autoconf/erlang.m4,
lib/autoconf/fortran.m4, lib/autoconf/functions.m4,
lib/autoconf/general.m4, lib/autoconf/lang.m4,
lib/autoconf/programs.m4, lib/autoconf/specific.m4,
lib/autoconf/status.m4, lib/autoconf/types.m4,
lib/autotest/general.m4, lib/autotest/specific.m4,
lib/m4sugar/m4sh.m4, lib/m4sugar/m4sugar.m4,
tests/autotest.at, tests/local.at, tests/m4sh.at,
tests/semantics.at, tests/tools.at, tests/torture.at: Fix macro
comment format.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>