[gtk+/wip/baedert/drawing: 341/348] centerbox: Add some missing return value annotations

[Timm Bäder <baedert src gnome org>]

commit 1f68b2a25d7acdf753c62fd9ed4e3814b3fb7bb5
Author: Timm Bäder <mail baedert org>
Date:   Wed Jul 5 13:09:32 2017 +0200

    centerbox: Add some missing return value annotations

 gtk/gtkcenterbox.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkcenterbox.c b/gtk/gtkcenterbox.c
index 549d34f..edcd572 100644
--- a/gtk/gtkcenterbox.c
+++ b/gtk/gtkcenterbox.c
@@ -799,7 +799,7 @@ gtk_center_box_set_end_widget (GtkCenterBox *self,
  *
  * Gets the start widget.
  *
- * Returns: the start widget.
+ * Returns: (transfer none): the start widget.
  *
  * Since: 3.92
  */
@@ -815,7 +815,7 @@ gtk_center_box_get_start_widget (GtkCenterBox *self)
  *
  * Gets the center widget.
  *
- * Returns: the center widget.
+ * Returns: (transfer none): the center widget.
  *
  * Since: 3.92
  */
@@ -831,7 +831,7 @@ gtk_center_box_get_center_widget (GtkCenterBox *self)
  *
  * Gets the end widget.
  *
- * Returns: the end widget.
+ * Returns: (transfer none): the end widget.
  *
  * Since: 3.92
  */