[gtk] widget: Fix size-allocate signal docs

[Timm Bäder <baedert src gnome org>]

commit c65c6ba11f9f87057389c923c1c4a3fd3cf36fb7
Author: Timm Bäder <mail baedert org>
Date:   Tue Nov 13 20:54:18 2018 +0100

    widget: Fix size-allocate signal docs

 gtk/gtkwidget.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 5ceda15ab5..2b39f28f39 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -1467,8 +1467,8 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   /**
    * GtkWidget::size-allocate:
    * @widget: the object which received the signal.
-   * @allocation: (type Gtk.Allocation): the region which has been
-   *   allocated to the widget.
+   * @width: the content width of the widget
+   * @height: the content height of the widget
    * @baseline: the baseline
    */
   widget_signals[SIZE_ALLOCATE] =