audio documentation content and building changes * Makefile.am: removed audiodevinfo.texi, audioplayer.texi, audiorecorder.texi and audiofile.texi from the target list * audio.txi: removed the menu to access the audio documentation files and removed includes for the audio documentation files * audioplayer.m: fixed a docstring that was using an un-escaped @ symbol * module.mk: added @audioplayer and @audioplayer method functions to the file list

gnulib-hg = gnulib-hg