[gtk+/client-side-decorations] Update some 'since' documentation

[Cody Russell <bratsche src gnome org>]

commit 7ac9773520d200fa4f13ff7851a21be8e4fd495c
Author: Cody Russell <bratsche gnome org>
Date:   Wed Dec 2 17:33:52 2009 -0600

    Update some 'since' documentation

 gtk/gtkwindow.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 46e009b..9be9737 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -855,7 +855,7 @@ gtk_window_class_init (GtkWindowClass *klass)
    * Normally client-side decorations should be controlled through
    * GtkWindow's 'client-side-decorated' style property.
    *
-   * Since: 2.18
+   * Since: 2.20
    */
   g_object_class_install_property (gobject_class,
                                    PROP_DISABLE_CLIENT_SIDE_DECORATIONS,
@@ -873,7 +873,7 @@ gtk_window_class_init (GtkWindowClass *klass)
    * Specifies that the window should draw its own decorations ratherthan
    * relying upon a window manager to do so.
    *
-   * Since: 2.18
+   * Since: 2.20
    */
   gtk_widget_class_install_style_property (widget_class,
                                            g_param_spec_boolean ("client-side-decorated",