[gtk+] ToolItem: Add see-also from proxy setter to signal

[Daniel Boles <dboles src gnome org>]

commit 5095ca6ed75d6cda88b338b4f0217153e2f6ed74
Author: Daniel Boles <dboles src gnome org>
Date:   Sun Sep 3 10:41:24 2017 +0100

    ToolItem: Add see-also from proxy setter to signal

 gtk/gtktoolitem.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktoolitem.c b/gtk/gtktoolitem.c
index 974ad58..09ee3ec 100644
--- a/gtk/gtktoolitem.c
+++ b/gtk/gtktoolitem.c
@@ -906,6 +906,8 @@ gtk_tool_item_rebuild_menu (GtkToolItem *tool_item)
  * Sets the #GtkMenuItem used in the toolbar overflow menu. The
  * @menu_item_id is used to identify the caller of this function and
  * should also be used with gtk_tool_item_get_proxy_menu_item().
+ *
+ * See also #GtkToolItem::create-menu-proxy.
  * 
  * Since: 2.4
  **/