[glib] Trivial typo fix

[Matthias Clasen <matthiasc src gnome org>]

commit 90da4ed628cf9e311c4730d529b5d53159035676
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 28 22:06:57 2013 -0400

    Trivial typo fix

 gobject/gsignal.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gobject/gsignal.c b/gobject/gsignal.c
index 7fb98b5..951b9c0 100644
--- a/gobject/gsignal.c
+++ b/gobject/gsignal.c
@@ -1965,7 +1965,7 @@ g_signal_override_class_closure (guint     signal_id,
  *
  * Overrides the class closure (i.e. the default handler) for the
  * given signal for emissions on instances of @instance_type with
- * callabck @class_handler. @instance_type must be derived from the
+ * callback @class_handler. @instance_type must be derived from the
  * type to which the signal belongs.
  *
  * See g_signal_chain_from_overridden() and