[gdl] dock-object: fix gtk-doc comment for dock signal

[Sebastien Granjoux <sgranjoux src gnome org>]

commit f7e2b3802d80934dd9bd9c60689cbc57c3171e93
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Tue Jun 6 21:41:22 2017 +0800

    dock-object: fix gtk-doc comment for dock signal
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783475

 gdl/gdl-dock-object.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gdl/gdl-dock-object.c b/gdl/gdl-dock-object.c
index 3ced214..b3753d1 100644
--- a/gdl/gdl-dock-object.c
+++ b/gdl/gdl-dock-object.c
@@ -304,6 +304,7 @@ gdl_dock_object_class_init (GdlDockObjectClass *klass)
 
     /**
      * GdlDockObject::dock:
+     * @item: The docked dock object.
      * @requestor: The widget to dock
      * @position: The position for the child
      * @other_data: (allow-none): Optional data giving additional information