manual: fix PDF url (trac https://trac.osgeo.org/grass/ticket/3267)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@70610 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.gwflow/r.gwflow.html

@@ -149,7 +149,7 @@ paraview --data=/tmp/gwdata_unconf2d.vtk &
 <h2>AUTHOR</h2>
 S&ouml;ren Gebbert
 <p>This work is based on the Diploma Thesis of S&ouml;ren Gebbert available
-<a href="http://www.hydrogeologie.tu-berlin.de/fileadmin/fg66/_hydro/Diplomarbeiten/2007_Diplomarbeit_Soeren_Gebbert.pdf">here</a>
+<a href="https://grass.osgeo.org/gdp/hydrology/gebbert2007_diplom_stroemung_grass_gis.pdf">here</a>
 at Technical University Berlin in Germany.
 
 <p><i>Last changed: $Date$</i>

raster/r.solute.transport/r.solute.transport.html

@@ -150,7 +150,7 @@ for dt in range(30):
 <h2>AUTHOR</h2>
 S&ouml;ren Gebbert
 <p>This work is based on the Diploma Thesis of S&ouml;ren Gebbert available
-<a href="http://www.hydrogeologie.tu-berlin.de/fileadmin/fg66/_hydro/Diplomarbeiten/2007_Diplomarbeit_Soeren_Gebbert.pdf">here</a>
+<a href="https://grass.osgeo.org/gdp/hydrology/gebbert2007_diplom_stroemung_grass_gis.pdf">here</a>
 at Technical University Berlin in Germany.
 
 

raster3d/r3.gwflow/r3.gwflow.html

@@ -134,7 +134,7 @@ paraview --data=/tmp/gwdata3d.vtk
 <h2>AUTHOR</h2>
 S&ouml;ren Gebbert
 <p>This work is based on the Diploma Thesis of S&ouml;ren Gebbert available
-<a href="http://www.hydrogeologie.tu-berlin.de/fileadmin/fg66/_hydro/Diplomarbeiten/2007_Diplomarbeit_S&ouml;ren_Gebbert.pdf">here</a>
+<a href="https://grass.osgeo.org/gdp/hydrology/gebbert2007_diplom_stroemung_grass_gis.pdf">here</a>
 at Technical University Berlin, Germany.
 
 <p><i>Last changed: $Date$</i>