[media] DocBook/audio.xml: synchronize attribute changes

Some attributes suffered some changes since DVBv1. Sync them with the
current API header files.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/linux/dvb/audio.h b/include/linux/dvb/audio.h
index fec66bd..d47bccd 100644
--- a/include/linux/dvb/audio.h
+++ b/include/linux/dvb/audio.h
@@ -67,7 +67,7 @@
 
 
 typedef
-struct audio_karaoke{  /* if Vocal1 or Vocal2 are non-zero, they get mixed  */
+struct audio_karaoke {  /* if Vocal1 or Vocal2 are non-zero, they get mixed  */
 	int vocal1;    /* into left and right t at 70% each */
 	int vocal2;    /* if both, Vocal1 and Vocal2 are non-zero, Vocal1 gets*/
 	int melody;    /* mixed into the left channel and */