[gtk+] GtkBox: Add missing Since in docs

[Alexander Larsson <alexl src gnome org>]

commit 43f1ac2b8f8e2e95125594e6e19735d687879c9f
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Mar 27 09:40:09 2013 +0100

    GtkBox: Add missing Since in docs

 gtk/gtkbox.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gtk/gtkbox.c b/gtk/gtkbox.c
index c1e916a..f4e88eb 100644
--- a/gtk/gtkbox.c
+++ b/gtk/gtkbox.c
@@ -1794,6 +1794,8 @@ gtk_box_get_spacing (GtkBox *box)
  * and the baseline is not allocated by the parent then
  * @position is used to allocate the baseline wrt the
  * extra space available.
+ *
+ * Since: 3.10
  */
 void
 gtk_box_set_baseline_position (GtkBox             *box,
@@ -1822,6 +1824,8 @@ gtk_box_set_baseline_position (GtkBox             *box,
  * Gets the value set by gtk_box_set_baseline_position().
  *
  * Return value: the baseline position
+ *
+ * Since: 3.10
  **/
 GtkBaselinePosition
 gtk_box_get_baseline_position (GtkBox         *box)