Quick sound manpage upgrade (syncs with FreeBSD).

man4: use .Mt for emails (1/2)

Bring in manpages from RELENG_6. Manpages related to sound imported in
January from FreeBSD were from HEAD, but the code from RELENG_6.

Obtained-from: FreeBSD

Say hello to a sound system update from FreeBSD. This includes the long
awaited Intel High Definition Audio (HDA) a.k.a. Azalia support.

The generic sound support module has been renamed to sound.k

Say hello to a sound system update from FreeBSD. This includes the long
awaited Intel High Definition Audio (HDA) a.k.a. Azalia support.

The generic sound support module has been renamed to sound.ko and the
"everything included" module is called snd_driver.ko now. Apart from
that, everything should continue working as normal, just better.

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