NUL not NULL

src/lib/libc/string/strchr.3

@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: strchr.3,v 1.2 1996/08/19 08:34:11 tholo Exp $
+.\"	$OpenBSD: strchr.3,v 1.3 1997/12/29 22:31:50 deraadt Exp $
 .\"
 .Dd June 29, 1991
 .Dt STRCHR 3
@@ -53,7 +53,7 @@ function locates the first occurrence of
 in the string pointed to by
 .Ar s .
 The terminating
-.Dv NULL
+.Dv NUL
 character is considered part of the string.
 If
 .Fa c