bsd.rd does not overlap the boot code... this problem is starting to
feel familiar.. tested by myself and claudio

prompted by/ok dlg@ deraadt@

grudgingly ok deraadt@

sparc.
ok miod@

pave the way for future work; ok since this does not change the generated
MAKEDEV

with a specific manpage reference.

limited to power change events and battery status retrieval.
ok deraadt@ mickey@

to the appropriate sections. No functional change, except for the manpage
being nicer.

same rules to both wskbd0:wskbd and wsmouse0:wsmouse; miod ok

ok deraadt@

- refer to the section 4 manual page for every device target, whenever
possible
- repair a few minor quoting errors
- repair a few sorting errors
- fix a few device descriptions (ideally they would be synched with the
.Nd line of their manpages, but we are not there... yet)
- minor mdoc fixes
Thanks to jmc@ for review and a lot of constructive criticism.