[gtk/gtk-3-22] docs: Use the appropriate deprecation for properties

[Emmanuele Bassi <ebassi src gnome org>]

commit 12913d1a3534a01863e0dd02ff92849fb83b8ec0
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Feb 11 16:45:53 2018 +0000

    docs: Use the appropriate deprecation for properties
    
    The GtkFontButton:font-name property has been deprecated, but it's using
    a non-standard annotation in its documentation.

 gtk/gtkfontbutton.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index 55150c5597..6c75c35db8 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -487,7 +487,8 @@ gtk_font_button_class_init (GtkFontButtonClass *klass)
    * The name of the currently selected font.
    *
    * Since: 2.4
-   * @Deprecated: Use the #GtkFontChooser::font property instead
+   *
+   * Deprecated: 3.22: Use the #GtkFontChooser::font property instead
    */
   g_object_class_install_property (gobject_class,
                                    PROP_FONT_NAME,