[glib] Document that g_variant_builder_add_value consumes a floating ref

[Matthias Clasen <matthiasc src gnome org>]

commit b27ecf79e89db9ba26aa3dedc1a3ae1e6255cf40
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Dec 28 00:19:45 2010 -0500

    Document that g_variant_builder_add_value consumes a floating ref
    
    Patch by Mikkel Kamstrup Erlandsen, bug
    https://bugzilla.gnome.org/show_bug.cgi?id=634569

 glib/gvariant.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/glib/gvariant.c b/glib/gvariant.c
index 8937445..a613a57 100644
--- a/glib/gvariant.c
+++ b/glib/gvariant.c
@@ -3058,6 +3058,9 @@ g_variant_builder_make_room (struct stack_builder *builder)
  * types or number of items in a tuple, putting more than one value into
  * a variant, etc.
  *
+ * If @value is a floating reference (see g_variant_ref_sink()),
+ * the @builder instance takes ownership of @value.
+ *
  * Since: 2.24
  **/
 void