fix docstring style in .m files * @audioplayer/__get_properties__.m, @audioplayer/audioplayer.m, @audioplayer/get.m, @audioplayer/isplaying.m, @audioplayer/pause.m, @audioplayer/play.m, @audioplayer/playblocking.m, @audioplayer/resume.m, @audioplayer/set.m, @audioplayer/stop.m, @audiorecorder/audiorecorder.m,@audiorecorder/get.m, @audiorecorder/getaudiodata.m, @audiorecorder/getplayer.m, @audiorecorder/isrecording.m, @audiorecorder/pause.m, @audiorecorder/play.m, @audiorecorder/record.m, @audiorecorder/recordblocking.m, @audiorecorder/resume.m, @audiorecorder/set.m, @audiorecorder/stop.m: Fix docstring style.

%!function r = f (x)
%!  if (ischar (x))
%!    r = x;
%!  else
%!    error ("expecting character string");
%!  endif
%!endfunction

%!assert (eval ("f 10;"), "10");