Document r260177, camcontrol '-b' addition.

Sponsored by:	The FreeBSD Foundation
Document r260338

Sponsored by:	The FreeBSD Foundation
Document r260385, unmapped I/O in GEOM RAID.

Sponsored by:	The FreeBSD Foundation
Fix order by svn revision.

Sponsored by:	The FreeBSD Foundation
Document r260431, kern.panic_reboot_wait_time sysctl.

Sponsored by:	The FreeBSD Foundation