[gtk+] docs: fix improper description of GtkTreeModel "rows-reordered" iter

[William Jon McCann <mccann src gnome org>]

commit 89a51bd15d4cccac7472bf53a710c2bb0f2014cc
Author: William Jon McCann <william jon mccann gmail com>
Date:   Wed Jan 22 01:21:27 2014 -0500

    docs: fix improper description of GtkTreeModel "rows-reordered" iter
    
    https://bugzilla.gnome.org/show_bug.cgi?id=698398

 gtk/gtktreemodel.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktreemodel.c b/gtk/gtktreemodel.c
index 8b52af0..b85b481 100644
--- a/gtk/gtktreemodel.c
+++ b/gtk/gtktreemodel.c
@@ -450,7 +450,8 @@ gtk_tree_model_base_init (gpointer g_class)
        * @tree_model: the #GtkTreeModel on which the signal is emitted
        * @path: a #GtkTreePath identifying the tree node whose children
        *     have been reordered
-       * @iter: a valid #GtkTreeIter pointing to the node whose
+       * @iter: a valid #GtkTreeIter pointing to the node whose children
+       *     have been reordered, or %NULL if the depth of @path is 0
        * @new_order: an array of integers mapping the current position
        *     of each child to its old position before the re-ordering,
        *     i.e. @new_order<literal>[newpos] = oldpos</literal>