doc: Update documentation in audio/ directory. * __get_properties__.m, audioplayer.m, disp.m, get.m, isplaying.m, pause.m, play.m, playblocking.m, resume.m, set.m, stop.m, subsasgn.m, subsref.m, __get_properties__.m, audiorecorder.m, disp.m, get.m, getaudiodata.m, getplayer.m, isrecording.m, pause.m, play.m, record.m, recordblocking.m, resume.m, set.m, stop.m, subsasgn.m, subsref.m, record.m, sound.m, soundsc.m: Re-write lots of documentation for clarity. Add @seealso links in @audioplayer and @audiorecorder classes.

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