Update release note:

Update release note:
	type of shm_segsz in struct shmid_ds to size_t from int,
	AltiVec support on powerpc,
	INTx disabled when MSI/MSIX enabled,
	sysctl leaf node now has an MPSAFE flag,
	hw.drm.msi tunable added,
	ale(4) in GENERIC on amd64 and i386,
	ata-raid(4) initial support for DDF metadata,
	cam(4) kern.cam.cd.retry_count sysctl,
	ciss(4) max device openings count fix,
	btpand(8) for NAP, GN, PANU profiles of bluetooth added, and
	improve description of the fetch(1) If-Modified-Since support.

Approved by:	re (implicit)

git-svn-id: svn://svn.freebsd.org/base/releng/7.2@191523 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f