[gtk+] liststore: Make a code snippet compile

[Timm Bäder <baedert src gnome org>]

commit e8376f5c0124fa6399fddb4c0952cfa124a35bc7
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 3 15:01:12 2018 +0100

    liststore: Make a code snippet compile

 gtk/gtkliststore.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkliststore.c b/gtk/gtkliststore.c
index ffbd17b..cc0ecb3 100644
--- a/gtk/gtkliststore.c
+++ b/gtk/gtkliststore.c
@@ -2164,8 +2164,17 @@ gtk_list_store_has_default_sort_func (GtkTreeSortable *sortable)
  * `gtk_list_store_insert_with_values (list_store, iter, position...)`
  * has the same effect as calling
  * |[<!-- language="C" -->
- * gtk_list_store_insert (list_store, iter, position);
- * gtk_list_store_set (list_store, iter, ...);
+ * static void
+ * insert_value (GtkListStore *list_store,
+ *               GtkTreeIter  *iter,
+ *               int           position)
+ * {
+ *   gtk_list_store_insert (list_store, iter, position);
+ *   gtk_list_store_set (list_store,
+ *                       iter
+ *                       // ...
+ *                       );
+ * }
  * ]|
  * with the difference that the former will only emit a row_inserted signal,
  * while the latter will emit row_inserted, row_changed and, if the list store