Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Add apic(4) man page, now mostly to cover its event timer functionality.
After several suggestions from people, move eventtimers page from 7 to 4.
[mdoc] Fixed .Dt call.
Add atrtc(4) manual page.