docs: Add deprecation notice for GtkButton.set_focus_on_click()

To match the deprecation annotation on the function declaration.

diff --git a/gtk/gtkbutton.c b/gtk/gtkbutton.c
index e24c065a8b48927d7accd7110979d0340c49e8ed..2d675a133892d7596b93c26e2141fc03342e4d7e 100644 (file)
--- a/gtk/gtkbutton.c
+++ b/gtk/gtkbutton.c
@@ -2314,6 +2314,8 @@ gtk_button_get_use_stock (GtkButton *button)
  * application.
  *
  * Since: 2.4
+ *
+ * Deprecated: 3.20: Use gtk_widget_set_focus_on_click() instead
  **/
 void
 gtk_button_set_focus_on_click (GtkButton *button,