Pull up following revision(s) (requested by nat in ticket #848):

share/man/man9/Makefile: revision 1.422
distrib/sets/lists/comp/mi: revision 1.2198
share/man/man7/Makefile: revision 1.33
share/man/man9/audio.9: revision 1.47
share/man/man7/audio.7: file removal
sys/dev/audio.c: revision 1.456
sys/dev/audio.c: revision 1.457
distrib/sets/lists/man/mi: revision 1.1591
share/man/man9/intro.9: revision 1.20
share/man/man7/audio.7: revision 1.3
share/man/man9/audio_system.9: revision 1.1
share/man/man7/intro.7: revision 1.26
share/man/man4/audio.4: revision 1.86

Fix a typo with sc_out/inports when setting the hardware recording gain on the
mix ring.  Found by mrg@
XXX pullup-8

Using audioctl without the -p switch defaults to the mix ring.  This allows
setting the hardware gain etc.

Update the audio spec in audio.7 to reflect these changes.
Addresses PR kern/52781.

Move the audio specification to section 9 under audio_system.
Ok wiz@

(martin)