[gtk+] Trivial typo fix

[Matthias Clasen <matthiasc src gnome org>]

commit 6f6cedcc66bda6f1639322d3e02bce7dda4893a6
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jul 12 14:46:00 2014 -0400

    Trivial typo fix

 gtk/gtklistbox.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtklistbox.c b/gtk/gtklistbox.c
index 3033902..7a12933 100644
--- a/gtk/gtklistbox.c
+++ b/gtk/gtklistbox.c
@@ -1048,7 +1048,7 @@ gtk_list_box_set_filter_func (GtkListBox           *box,
  *
  * Note that you may get many calls @update_header to this for a particular row when e.g.
  * changing things that don’t affect the header. In this case it is important for performance
- * to not blindly replace an exisiting header widh an identical one.
+ * to not blindly replace an existing header with an identical one.
  *
  * The @update_header function will be called for each row after the call, and it will
  * continue to be called each time a row changes (via gtk_list_box_row_changed()) and when