Document r260448.

Sponsored by:	The FreeBSD Foundation
Move r260532 to kernel-virtualization.

Sponsored by:	The FreeBSD Foundation
Document r260410.

Sponsored by:	The FreeBSD Foundation
Move r260903, misplaced.

Sponsored by:	The FreeBSD Foundation
Reformat to fix a nit in the rendered output.

Sponsored by:	The FreeBSD Foundation