[gtk+] Add since tags to new api

[Matthias Clasen <matthiasc src gnome org>]

commit 7cf3eec85b171d0e51b356b29446b58a86feb44d
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Oct 22 19:27:13 2015 -0400

    Add since tags to new api
    
    gtk_widget_class_set/get_css_name were missing it.

 gtk/gtkwidget.c |   14 +++++++++-----
 gtk/gtkwidget.h |    4 ++--
 2 files changed, 11 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index df34d10..4b1668d 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -16321,11 +16321,13 @@ gtk_widget_clear_path (GtkWidget *widget)
  * @widget_class: class to set the name on
  * @name: name to use
  *
- * Sets the name to be used for CSS matching of widgets. 
+ * Sets the name to be used for CSS matching of widgets.
  *
- * If this function is not calles for a given class, the name
+ * If this function is not called for a given class, the name
  * of the parent class is used.
- **/
+ *
+ * Since: 3.20
+ */
 void
 gtk_widget_class_set_css_name (GtkWidgetClass *widget_class,
                                const char     *name)
@@ -16344,10 +16346,12 @@ gtk_widget_class_set_css_name (GtkWidgetClass *widget_class,
  * gtk_widget_class_get_css_name:
  * @widget_class: class to set the name on
  *
- * Gets the name used by this class for matching in CSS code. See 
+ * Gets the name used by this class for matching in CSS code. See
  * gtk_widget_class_set_css_name() for details.
  *
- * Returns: the CSS name of the given class.
+ * Returns: the CSS name of the given class
+ *
+ * Since: 3.20
  */
 const char *
 gtk_widget_class_get_css_name (GtkWidgetClass *widget_class)
diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index 6aeda83..67441de 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -1302,10 +1302,10 @@ GtkStyleContext * gtk_widget_get_style_context (GtkWidget *widget);
 GDK_AVAILABLE_IN_ALL
 GtkWidgetPath *   gtk_widget_get_path (GtkWidget *widget);
 
-/*GDK_AVAILABLE_IN_3_20*/
+GDK_AVAILABLE_IN_3_20
 void              gtk_widget_class_set_css_name (GtkWidgetClass *widget_class,
                                                  const char     *name);
-/*GDK_AVAILABLE_IN_3_20*/
+GDK_AVAILABLE_IN_3_20
 const char *      gtk_widget_class_get_css_name (GtkWidgetClass *widget_class);
 
 GDK_AVAILABLE_IN_3_4