avg 26971f5ebd add superio.4 and superio.9 manual pages
This adds basic documentation on what the superio driver is and how
other drivers can interact with it.  I decided to also document
superio's ivar accessors.

Reviewed by:	bcr, brueffer (both manual contents only)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D21958
2019-10-11 11:13:47 +00:00
..