To run a bhyve guest with multiple vCPUs, the "VMX unrestriced mode" or "unrestricted guest privileges (UG)" mode is required from the CPU. The current section in the handbook doesn't mention this and may throw new folks off as they are getting started with FreeBSD and bhyve. See Peter Grehan's note in this thread: http://freebsd.1045724.n5.nabble.com/VM-unrestricted-guest-capability-required-td5953993.html
Also, since ZFS is getting quite popular within the FreeBSD community, it seems fit to show the user how to create a zfs volume for use with bhyve.
This change adds a couple sentences in the intro paragraph about the required CPU UG feature if they are planning on creating vms with multiple vCPUS and also adds a section titled "Using ZFS with Bhyve Guests".
Comments, feedback welcome. Happy to change as you guys see fit.