[gtk/wip/phako/fix-activate-action-annotation] Remove obsolete "or %NULL" documentation

[Jens Georg <jensgeorg src gnome org>]

commit b9551a89525c6fcd4b8a335ca4a9d90f7bd3fda6
Author: Jens Georg <mail jensge org>
Date:   Wed Apr 20 15:15:51 2022 +0200

    Remove obsolete "or %NULL" documentation

 gtk/gtkwidget.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 56e3fa25bf..18816ac5bf 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -11345,8 +11345,7 @@ gtk_widget_activate_action_variant (GtkWidget  *widget,
  * gtk_widget_activate_action:
  * @widget: a `GtkWidget`
  * @name: the name of the action to activate
- * @format_string: (nullable): GVariant format string for arguments or %NULL
- *   for no arguments
+ * @format_string: (nullable): GVariant format string for arguments
  * @...: arguments, as given by format string
  *
  * Looks up the action in the action groups associated