say what it does

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@41030 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.statistics2/main.c

@@ -101,7 +101,7 @@ int main(int argc, char **argv)
     G_add_keyword(_("raster"));
     G_add_keyword(_("statistics"));
     module->description =
-	_("Calculates category or object oriented statistics.");
+	_("Calculates category or object oriented statistics (accumulator-based statistics).");
 
     opt.basemap = G_define_standard_option(G_OPT_R_BASE);