Add relnotes items:

Add relnotes items:
	cxgbe(4) for Chelsio T4 added,
	dc(4) PAE support on FreeBSD/i386,
	re(4) RTL8401E support added,
	IPsec HMAC-SHA-256/384/512 authenticator hash size fix,
	cc(4) TCP_CONGESTION socket option,
	Citrus iconv imported (but disabled by default),
	utxrm(8) utility added,
	GNU binutils to 2.17.50,
	LLVM/Clang 3.0 imported,
	xz to 5.0.1,
	bsdinstall(8) added as the default installer.

git-svn-id: svn://svn.freebsd.org/base/stable/9@229817 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f