[src/trunk]: src/games/dab dab.6: fix URL reference to the book

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/40a58a5effad
branches:  trunk
changeset: 1026737:40a58a5effad
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Dec 05 09:46:05 2021 +0000

description:
dab.6: fix URL reference to the book

diffstat:

 games/dab/dab.6 |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 56581ea531f9 -r 40a58a5effad games/dab/dab.6
--- a/games/dab/dab.6   Sun Dec 05 09:22:45 2021 +0000
+++ b/games/dab/dab.6   Sun Dec 05 09:46:05 2021 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: dab.6,v 1.7 2015/02/12 06:24:21 dholland Exp $
+.\"    $NetBSD: dab.6,v 1.8 2021/12/05 09:46:05 rillig Exp $
 .\"
 .\" Copyright (c) 2003 Thomas Klausner.
 .\"
@@ -22,7 +22,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd October 7, 2012
+.Dd December 5, 2021
 .Dt DAB 6
 .Os
 .Sh NAME
@@ -105,7 +105,7 @@
 .%T The Dots and Boxes Game: Sophisticated Child's Play
 .%D 2000
 .%I A K Peters
-.%U http://www.akpeters.com/book.asp?bID=111
+.%U urn:ISBN:9781568811291
 .Re
 .Sh AUTHORS
 .An Christos Zoulas