[gtk/bilelmoussaoui/g-i] g-i: mark gtk_text_iter_get_paintable as nullable

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 0f67e465496ebeecb08f6c1b7d645b468cf77b87
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Wed Jan 19 10:22:40 2022 +0000

    g-i: mark gtk_text_iter_get_paintable as nullable

 gtk/gtktextiter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtktextiter.c b/gtk/gtktextiter.c
index d3a094826f..7da46fda8c 100644
--- a/gtk/gtktextiter.c
+++ b/gtk/gtktextiter.c
@@ -1025,7 +1025,7 @@ gtk_text_iter_get_visible_text (const GtkTextIter  *start,
  *
  * Otherwise, %NULL is returned.
  *
- * Returns: (transfer none): the paintable at @iter
+ * Returns: (transfer none) (nullable): the paintable at @iter
  **/
 GdkPaintable *
 gtk_text_iter_get_paintable (const GtkTextIter *iter)