[gcompris] lightsoff: the documentation was pointing to a dead link. Put Wikipedia to replace it.

[Bruno Coudoin <bcoudoin src gnome org>]

commit db8b4dbfb32056ca0580dcc51ad628a223b0e34e
Author: Bruno Coudoin <bruno coudoin free fr>
Date:   Tue Jun 26 22:42:58 2012 +0200

    lightsoff: the documentation was pointing to a dead link. Put Wikipedia to replace it.

 src/lightsoff-activity/lightsoff.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/lightsoff-activity/lightsoff.xml.in b/src/lightsoff-activity/lightsoff.xml.in
index 6a0440c..cfa0c53 100644
--- a/src/lightsoff-activity/lightsoff.xml.in
+++ b/src/lightsoff-activity/lightsoff.xml.in
@@ -13,6 +13,6 @@
         <_prerequisite></_prerequisite>
         <_goal>The aim is to switch off all the lights.</_goal>
 	<_manual>The effect of pressing a button is to toggle the state of that button, and of its immediate vertical and horizontal neighbours. The sun and the color of the sky depend on the number of clicks needed to solve the puzzle. If you click on Tux, the solution is shown.</_manual>
-        <_credit>The solver algorithm described on haar.clara.co.uk is a valuable resource to know more about the Lights Off game: &lt;http://www.haar.clara.co.uk/Lights/solving.html&gt;</_credit>
+        <_credit>The solver algorithm is described on Wikipedia. To know more about the Lights Off game: &lt;http://en.wikipedia.org/wiki/Lights_Out_(game)&gt;</_credit>
   </Board>
 </GCompris>