[gtk+] Document gtk_printer_option_set_get_groups

[Matthias Clasen <matthiasc src gnome org>]

commit 33851dbe24e4419640a7c1d18264d92d6f9ed9f4
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Oct 22 00:34:41 2014 -0400

    Document gtk_printer_option_set_get_groups

 gtk/gtkprinteroptionset.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkprinteroptionset.c b/gtk/gtkprinteroptionset.c
index d28b0fb..b063445 100644
--- a/gtk/gtkprinteroptionset.c
+++ b/gtk/gtkprinteroptionset.c
@@ -143,8 +143,11 @@ gtk_printer_option_set_clear_conflicts (GtkPrinterOptionSet *set)
 
 /**
  * gtk_printer_option_set_get_groups:
+ * @set: a #GtkPrinterOptionSet
  *
- * Returns: (element-type utf8) (transfer full):
+ * Gets the groups in this set.
+ *
+ * Returns: (element-type utf8) (transfer full): a list of group names.
  */
 GList *
 gtk_printer_option_set_get_groups (GtkPrinterOptionSet *set)