Fix typos and -mdoc usage.

PR:		docs/11537
Submitted by:	Motomichi Matsuzaki <mzaki@e-mail.ne.jp>

sbin/kget/kget.8

@@ -22,11 +22,11 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$Id$
+.\"	$Id: kget.8,v 1.1 1999/02/27 02:24:18 jkh Exp $
 .\"
 .Dd Feb 20, 1999
 .Dt KGET 8
-.Os BSD 3
+.Os FreeBSD
 .Sh NAME
 .Nm kget
 .Nd print kernel change information.
@@ -44,7 +44,7 @@ from having to re-enter it each time the system is booted.
 .Pp
 .Nm
 uses the
-.Xt sysctl 3
+.Xr sysctl 3
 interface to retrieve data from the kernel and requires that at least
 the
 .Ar machdep.uc_devlist
@@ -66,5 +66,7 @@ Sure to be some.
 .Sh HISTORY
 The
 .Nm
-command appeared in FreeBSD 3.1, as part of the PicoBSD distribution by
+command appeared in
+.Fx 3.1 ,
+as part of the PicoBSD distribution by
 .An Andrzej Bialecki