[gtk/ebassi/docs-fixes: 2/2] docs: Annotate Label.get_selection_bounds() out arguments

[Emmanuele Bassi <ebassi src gnome org>]

commit ff3bb7f671701c10cd02ed7975da1c9da66a3bc2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 15 15:33:56 2021 +0000

    docs: Annotate Label.get_selection_bounds() out arguments
    
    They are optional, and should be marked as such.
    
    See issue: #4452

 gtk/gtklabel.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index 8f94d8ab36..41041b3a9e 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -3810,7 +3810,7 @@ gtk_label_set_ellipsize (GtkLabel          *self,
  * See [method@Gtk.Label.set_ellipsize].
  *
  * Returns: `PangoEllipsizeMode`
- **/     
+ **/
 PangoEllipsizeMode
 gtk_label_get_ellipsize (GtkLabel *self)
 {
@@ -4962,8 +4962,8 @@ gtk_label_select_region  (GtkLabel *self,
 /**
  * gtk_label_get_selection_bounds:
  * @self: a `GtkLabel`
- * @start: (out): return location for start of selection, as a character offset
- * @end: (out): return location for end of selection, as a character offset
+ * @start: (out) (optional): return location for start of selection, as a character offset
+ * @end: (out) (optional): return location for end of selection, as a character offset
  *
  * Gets the selected range of characters in the label.
  *