[gtk+/gtk-3-20] Remove a few mentions of GtkVBox in the docs

[Matthias Clasen <matthiasc src gnome org>]

commit d92d9171e2e23f0544f03072d0d1c2f3c2d567f9
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jul 12 21:57:46 2016 -0400

    Remove a few mentions of GtkVBox in the docs
    
    We only have GtkBox nowadays.

 gtk/gtkmessagedialog.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkmessagedialog.c b/gtk/gtkmessagedialog.c
index ae6f5e5..e70c820 100644
--- a/gtk/gtkmessagedialog.c
+++ b/gtk/gtkmessagedialog.c
@@ -292,7 +292,7 @@ gtk_message_dialog_class_init (GtkMessageDialogClass *class)
                                   PROP_MESSAGE_AREA,
                                   g_param_spec_object ("message-area",
                                                        P_("Message area"),
-                                                       P_("GtkVBox that holds the dialog's primary and 
secondary labels"),
+                                                       P_("GtkBox that holds the dialog's primary and 
secondary labels"),
                                                        GTK_TYPE_WIDGET,
                                                        GTK_PARAM_READABLE));
 
@@ -914,7 +914,7 @@ gtk_message_dialog_format_secondary_markup (GtkMessageDialog *message_dialog,
  * See gtk_dialog_get_content_area() for the corresponding
  * function in the parent #GtkDialog.
  *
- * Returns: (transfer none): A #GtkVBox corresponding to the
+ * Returns: (transfer none): A #GtkBox corresponding to the
  *     “message area” in the @message_dialog.
  *
  * Since: 2.22