- Fix spelling.

- Fix spelling.
- Add relnotes items:
        nxstack on powerpc,
        ral(4) and run(4) ieee80211_ratectl_node_init() call fix,
        re(4) RTL8168E/8111E-VL support added,
        re(4) TX/RX checksum offloading configuarable independently,
        cpuset(1) -C and "all" keyword added,
        sh(1) exit status in trap action for !EXIT signals,
        sh(1) trap -- handling,
        ACPI CA to 20110527.

git-svn-id: svn://svn.freebsd.org/base/stable/9@229793 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f