[gtk: 3/4] columnviewcolumn: Improve docs

[Matthias Clasen <matthiasc src gnome org>]

commit 837f398a9b8d4d4f94f0a871e58e134fbcc8640b
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 30 23:40:03 2020 -0500

    columnviewcolumn: Improve docs
    
    Mention what setting sorter to NULL means.

 gtk/gtkcolumnviewcolumn.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtkcolumnviewcolumn.c b/gtk/gtkcolumnviewcolumn.c
index 51d0388707..fd70a247d1 100644
--- a/gtk/gtkcolumnviewcolumn.c
+++ b/gtk/gtkcolumnviewcolumn.c
@@ -742,6 +742,9 @@ gtk_column_view_column_remove_from_sorter (GtkColumnViewColumn *self)
  *
  * Associates a sorter with the column.
  *
+ * If @sorter is %NULL, the column will not let users change
+ * the sorting by clicking on its header.
+ *
  * This sorter can be made active by clicking on the column
  * header, or by calling gtk_column_view_sort_by_column().
  *