r.grow.distance: screenshot added

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@65168 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.grow.distance/r.grow.distance.html

@@ -70,7 +70,13 @@ r.grow.distance input=streams_derived distance=dist_from_streams
 
 <div align="center" style="margin: 10px">
 <img src="r_grow_distance.png" border=0><br>
-<i>Distance from the streams network in meters (map subset)</i>
+<i>Euclidean distance from the streams network in meters (map subset)</i>
+</div>
+
+<div align="center" style="margin: 10px">
+<img src="r_grow_distance_zoom.png" border=0><br>
+<i>Euclidean distance from the streams network in meters (detail, numbers shown
+   with d.rast.num)</i>
 </div>
 
 <p>