[gtk+] label docs: Mention common style classes

[Matthias Clasen <matthiasc src gnome org>]

commit 953aa45c047efa4f84485e6a8aa5c26164cde816
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 25 18:53:56 2015 -0400

    label docs: Mention common style classes
    
    Mention some of the style classes that are commonly used
    with labels.

 gtk/gtklabel.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index e10558f..e669ed9 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -73,7 +73,9 @@
  *
  * # CSS nodes
  *
- * GtkLabel has a single CSS node with the name label.
+ * GtkLabel has a single CSS node with the name label. A wide variety
+ * of style classes may be applied to labels, such as .title, .subtitle,
+ * .dim-label, etc.
  *
  * # GtkLabel as GtkBuildable
  *