[gtk+] Improve headerbar docs slightly

[Matthias Clasen <matthiasc src gnome org>]

commit eab0b3a59c6aedc602171029542b60336813838b
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 16 20:24:48 2013 -0400

    Improve headerbar docs slightly
    
    Explain how to achieve the same title lable style when using
    a custom title.

 gtk/gtkheaderbar.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index c1c1842..3897a58 100644
--- a/gtk/gtkheaderbar.c
+++ b/gtk/gtkheaderbar.c
@@ -937,7 +937,9 @@ gtk_header_bar_get_title (GtkHeaderBar *bar)
  *
  * Note that GtkHeaderBar always reserves room for the subtitle, even
  * if none is currently set. If this is not desired, use
- * gtk_header_bar_set_custom_title().
+ * gtk_header_bar_set_custom_title() to place your own label in the
+ * title position. To achieve the same style, use the "title" style
+ * class.
  *
  * Since: 3.10
  */