url updated

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@32858 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.in.xyz/r.in.xyz.html

@@ -152,7 +152,7 @@ Typical commands to create a DEM using a regularized spline fit:
 
 <h2>EXAMPLE</h2>
 
-Import the <a href="http://mpa.itc.it/grasstutor/data_menu2nd.phtml">Jockey's
+Import the <a href="http://www.grassbook.org/data_menu2nd.phtml">Jockey's
 Ridge, NC, LIDAR dataset</a>, and process into a clean DEM:
 
 <div class="code"><pre>

vector/v.surf.rst/v.surf.rst.html

@@ -342,7 +342,7 @@ problem, Computers and Mathematics with Applications, v.16, p. 983-992.
 </p>
 
 <p>
-<a href="http://mpa.itc.it/grasstutor/">
+<a href="http://www.grassbook.org">
 Neteler, M. and Mitasova, H., 2004, Open Source GIS: A GRASS GIS Approach, Second Edition, </a> 
 Kluwer International Series in Engineering and Computer Science, 773, Kluwer Academic Press / Springer, 
 Boston, Dordrecht, 424 pages.

vector/v.vol.rst/v.vol.rst.html

@@ -140,7 +140,7 @@ representing the whole dataset.
 
 <P>
 <i>Example 
- (based on <a href="http://mpa.itc.it/grasstutor/data_menu2nd.phtml">Slovakia3d dataset</a>):</i>
+ (based on <a href="http://www.grassbook.org/data_menu2nd.phtml">Slovakia3d dataset</a>):</i>
 <P>
 <div class="code"><pre>
 v.info -c precip3d