[gimp] Document other layer_group-relevant procedures in gimp_layer_group_new.

[Ed J <edj src gnome org>]

commit e7501448faccb26997a534a747c888d98ff39b1d
Author: Ed J <edj src gnome org>
Date:   Sat May 3 00:44:29 2014 +0100

    Document other layer_group-relevant procedures in gimp_layer_group_new.

 libgimp/gimplayer_pdb.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libgimp/gimplayer_pdb.c b/libgimp/gimplayer_pdb.c
index fbc9e29..ff9c1c6 100644
--- a/libgimp/gimplayer_pdb.c
+++ b/libgimp/gimplayer_pdb.c
@@ -177,6 +177,9 @@ gimp_layer_new_from_drawable (gint32 drawable_ID,
  * the new layer group (which is a kind of layer) with the
  * gimp_image_insert_layer() command.
  *
+ * Other procedures useful with layer groups: gimp_image_reorder_item(),
+ * gimp_item_get_parent(), gimp_item_get_children(), gimp_item_is_group().
+ *
  * Returns: The newly created layer group.
  *
  * Since: GIMP 2.8