[gtk/gtk-4-6] fix docs for gtk_accessible_update_relation example

[Matthias Clasen <matthiasc src gnome org>]

commit 53263d3d27233c83917839a0977b6501e4edf696
Author: Caolán McNamara <caolanm redhat com>
Date:   Wed Mar 9 12:27:32 2022 +0000

    fix docs for gtk_accessible_update_relation example

 gtk/gtkaccessible.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkaccessible.c b/gtk/gtkaccessible.c
index a5a8797ddd..ce4fdb07bf 100644
--- a/gtk/gtkaccessible.c
+++ b/gtk/gtkaccessible.c
@@ -425,7 +425,7 @@ gtk_accessible_reset_property (GtkAccessible         *self,
  * gtk_accessible_update_relation (accessible,
  *                                 GTK_ACCESSIBLE_RELATION_CONTROLS,
  *                                   ref1, NULL,
- *                                 GTK_ACCESSIBLE_LABELLED_BY,
+ *                                 GTK_ACCESSIBLE_RELATION_LABELLED_BY,
  *                                   ref1, ref2, ref3, NULL,
  *                                 -1);
  * ```