[glib] Clarify documentation of GValueTransform

[Philip Withnall <pwithnall src gnome org>]

commit 7641aedd5bd70f1cff8e0bab02be57d58b625c20
Author: Stef Walter <stef thewalter net>
Date:   Sat Oct 23 03:50:12 2010 +0000

    Clarify documentation of GValueTransform
    
    Note in documentation of GValueTransform that dest_value
    is already initialized.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=632953

 gobject/gvalue.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gobject/gvalue.h b/gobject/gvalue.h
index e4760f4..9d8f034 100644
--- a/gobject/gvalue.h
+++ b/gobject/gvalue.h
@@ -88,6 +88,8 @@ G_BEGIN_DECLS
  * 
  * The type of value transformation functions which can be registered with
  * g_value_register_transform_func().
+ *
+ * @dest_value will be initialized to the correct destination type.
  */
 typedef void (*GValueTransform) (const GValue *src_value,
                                 GValue       *dest_value);