Add more relnotes items for 8.2R:

Add more relnotes items for 8.2R:
	new sysctls: vm.kmem_map_size, vm.kmem_map_free,
	GPT support improved,
	ipfw0 interface panic due to multicast traffic injection fixed,
	lagg(4) net.link.lagg.failover_rx_all knob added,
	linprocfs(5) /proc/$$/environment support,
	ZFS now allows offlining log devices,
	gpart(8) -F option added,
	gaprt(8) more GPT attributes,
	mount(8) "rw" flags in -p option's output fixed,
	ncal(1) -A -B -C added,
	ntpd(8) SHM ref clock driver enabled,
	ruptime(1) hostname length extended, and
	tr(1) [=]=] regexp class fixed

Approved by:	re (implicit)

git-svn-id: svn://svn.freebsd.org/base/releng/8.2@218444 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f