r.grow: keyword sync to trunk

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@67394 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r.grow/r.grow.py

@@ -17,6 +17,8 @@
 #%Module
 #% description: Generates a raster map layer with contiguous areas grown by one cell.
 #% keyword: raster
+#% keyword: distance
+#% keyword: proximity
 #%end
 #%flag
 #% key: m