[gtk/wip/tintou/set_css_classes_array] widget: Add array annotation to set_css_classes

[Corentin Noël <corentinnoel src gnome org>]

commit 80473ccd69f7e7315f0facc71a25fed1350c8864
Author: Corentin Noël <corentin noel collabora com>
Date:   Fri May 15 12:00:50 2020 +0200

    widget: Add array annotation to set_css_classes
    
    It expects a NULL-terminated array so annotate it.

 gtk/gtkwidget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 7814352765..c314305071 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -12720,7 +12720,7 @@ gtk_widget_get_css_classes (GtkWidget *widget)
 /**
  * gtk_widget_set_css_classes:
  * @widget: a #GtkWidget
- * @classes: (transfer none): %NULL-terminated list
+ * @classes: (transfer none) (array zero-terminated=1): %NULL-terminated list
  *   of css classes to apply to @widget.
  *
  * Will clear all css classes applied to @widget