Included info from Glynn on r.grow tie-breaking rules (synched with g6_devel: https://trac.osgeo.org/grass/changeset/31444)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@31445 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.grow2/description.html

@@ -51,6 +51,12 @@ The <i>Maximum metric</i> is given by the formula
 
 where the isolines of distance from a point are squares.
 
+<p>
+
+If there are two cells which are equal candidates to grow into an empty space, 
+<em>r.grow</em> will choose the northernmost candidate; if there are multiple 
+candidates with the same northing, the westernmost is chosen. 
+
 <h2>SEE ALSO</h2>
 
 <em><a href="r.buffer.html">r.buffer</a></em><br>