ovsdb-idl: Remove a misleading comment for change tracking.
The comment was added when the feature was introduced but what it
described is not what is implemented, probably because of revisions
after code reviews.
@@ -2834,9 +2834,7 @@ ovsdb_idl_row_clear_arcs(struct ovsdb_idl_row *row, bool destroy_dsts)
struct ovsdb_idl_arc *arc, *next;
/* Delete all forward arcs. If 'destroy_dsts', destroy any orphaned rows
- * that this causes to be unreferenced, if tracking is not enabled.
- * If tracking is enabled, orphaned nodes are removed from hmap but not
- * freed.
+ * that this causes to be unreferenced.
*/
LIST_FOR_EACH_SAFE (arc, next, src_node, &row->src_arcs) {
ovs_list_remove(&arc->dst_node);
