Update release notes:

Update release notes:
	DDB show mount added,
	sparc64 US III support,
	DRM r600/r700,
	ae(4) WoL support,
	hardware MAC stats: cxgb(4), msk(4), nfe(4),
	re(4) hw.re.prefer_iomap,
	sis(4) VLAN tagging bugfix,
	txp(4) update,
	TCP MD5 signature option for IPv6,
	gpart(8) updated; APM and EBR scheme support,
	mpt(4) in GENERIC on sparc64,
	vfs.nfs.prime_access_cache for NFSv3,
	ncal(1) multibyte support,
	csup CVSMode support,
	du(1) -A and -B option added,
	makefs(8) added, and
	mergemaster(8) -F option added.

Approved by:	re (implicit)

git-svn-id: svn://svn.freebsd.org/base/releng/7.2@191602 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f