[gtk+] docs: fix GtkWidget::size-allocate description

[Matthias Clasen <matthiasc src gnome org>]

commit 3d956db500bc6ab2d9fe4d50cfb5b682fb835d98
Author: Marcus Karlsson <mk acc umu se>
Date:   Tue Apr 8 22:40:01 2014 +0200

    docs: fix GtkWidget::size-allocate description
    
    The documentation for the GtkWidget::size-allocate signal is missing the
    description of the "allocation" parameter. Add the missing description
    to the parameter.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=726179

 gtk/gtkwidget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index d3d78dd..4e26f71 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -1779,7 +1779,7 @@ G_GNUC_END_IGNORE_DEPRECATIONS
   /**
    * GtkWidget::size-allocate:
    * @widget: the object which received the signal.
-   * @allocation:
+   * @allocation: the region which has been allocated to the widget.
    */
   widget_signals[SIZE_ALLOCATE] =
     g_signal_new (I_("size-allocate"),