[gtk] builder: Fix typo in docs

[Benjamin Otte <otte src gnome org>]

commit e3860d25e94a8f84b0dd855b5f6a1947180964e0
Author: Benjamin Otte <otte redhat com>
Date:   Mon Nov 18 01:11:24 2019 +0100

    builder: Fix typo in docs

 gtk/gtkbuilder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkbuilder.c b/gtk/gtkbuilder.c
index 78f3fee3f8..9277628a95 100644
--- a/gtk/gtkbuilder.c
+++ b/gtk/gtkbuilder.c
@@ -2644,7 +2644,7 @@ gtk_builder_add_callback_symbols (GtkBuilder  *builder,
  * with gtk_builder_add_callback_symbols()
  *
  * This function is intended for possible use in language bindings
- * or for any case that one might be cusomizing signal connections
+ * or for any case that one might be customizing signal connections
  * using gtk_builder_connect_signals_full()
  *
  * Returns: (nullable): The callback symbol in @builder for @callback_name, or %NULL