updated URL from Leandro Costa;

ok millert@

src/lib/libc/hash/sha1.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sha1.3,v 1.21 2001/10/29 18:08:29 millert Exp $
+.\"	$OpenBSD: sha1.3,v 1.22 2003/05/06 19:13:10 jmc Exp $
 .\"
 .\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 .\" All rights reserved.
@@ -25,7 +25,8 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 .\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" See http://csrc.nist.gov/fips/fip180-1.txt for the detailed standard
+.\" See http://csrc.nist.gov/publications/fips/fips180-1/fip180-1.txt
+.\" for the detailed standard
 .\"
 .Dd July 10, 1997
 .Dt SHA1 3