use 2-clause BSD license as per hoskins strike-off july 22 1999.

use wording of FreeBSD License.

lib/libc/sys/shutdown.2

@@ -1,3 +1,4 @@
+.\" Copyright (c) 2006-2007 The FreeBSD Project. All rights reserved.
 .\" Copyright (c) 1983, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\"
@@ -9,11 +10,8 @@
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
 .\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND
 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
@@ -25,6 +23,10 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
+.\" The views and conclusions contained in the software and documentation
+.\" are those of the authors and should not be interpreted as representing
+.\" official policies, either expressed or implied, of the FreeBSD Project.
+.\"
 .\"     @(#)shutdown.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"