v.db.connect: add keyword layer

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@56302 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.db.connect/main.c

@@ -51,6 +51,7 @@ int main(int argc, char **argv)
     G_add_keyword(_("vector"));
     G_add_keyword(_("attribute table"));
     G_add_keyword(_("database"));
+    G_add_keyword(_("layer"));
     module->description =
 	_("Prints/sets DB connection for a vector map to attribute table.");