url update

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@41538 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.watershed/front/r.watershed.html

@@ -435,8 +435,8 @@ Ehlschlaeger, C. (1989). <i>Using the A<sup>T</sup> Search Algorithm
 to Develop Hydrologic Models from Digital Elevation Data</i>,
 <b>Proceedings of International Geographic Information Systems (IGIS)
 Symposium '89</b>, pp 275-281 (Baltimore, MD, 18-19 March 1989).<br>
-URL: <a href="http://faculty.wiu.edu/CR-Ehlschlaeger2/older/IGIS/paper.html">
-http://faculty.wiu.edu/CR-Ehlschlaeger2/older/IGIS/paper.html</a>
+URL: <a href="http://chuck.ehlschlaeger.info/older/IGIS/paper.html">
+http://chuck.ehlschlaeger.info/older/IGIS/paper.html</a>
 
 <p>
 Holmgren, P. (1994). <i>Multiple flow direction algorithms for runoff