Sort sections, sort SEE ALSO, remove some unnecessary .Pp, and some
other fixes.

More and more of .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Many more to
come.

Attempt to finish off PR#2008, and document our SCSI subsystem.
Add references to ATAPI support; do a quick job from UTSL on scanners,
and the changer thing. Also document that SCSI bus Ethernet inte

Attempt to finish off PR#2008, and document our SCSI subsystem.
Add references to ATAPI support; do a quick job from UTSL on scanners,
and the changer thing. Also document that SCSI bus Ethernet interface
that appears to be supported. Clean up some nroff stuff in the exiting
pages.

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