[gtk+] Explicitely mention -1 in the insert_with_values docs

[Paolo Borelli <pborelli src gnome org>]

commit 9ff75882c09c00b75d6e6e41f0d091800a08eb1b
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Mar 10 19:32:56 2012 +0100

    Explicitely mention -1 in the insert_with_values docs
    
    -1 means "append". Spell it out like we do for ListStore docs.

 gtk/gtktreestore.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtktreestore.c b/gtk/gtktreestore.c
index 1c6d636..773a256 100644
--- a/gtk/gtktreestore.c
+++ b/gtk/gtktreestore.c
@@ -1490,11 +1490,11 @@ gtk_tree_store_insert_after (GtkTreeStore *tree_store,
  * @tree_store: A #GtkTreeStore
  * @iter: (out) (allow-none): An unset #GtkTreeIter to set the new row, or %NULL.
  * @parent: (allow-none): A valid #GtkTreeIter, or %NULL
- * @position: position to insert the new row
+ * @position: position to insert the new row, or -1 to append after existing rows
  * @...: pairs of column number and value, terminated with -1
  *
  * Creates a new row at @position. @iter will be changed to point to this
- * new row. If @position is larger than the number of rows on the list, then
+ * new row. If @position is -1, or larger than the number of rows on the list, then
  * the new row will be appended to the list. The row will be filled with
  * the values given to this function.
  *