[glib] gnotification: Add missing deprecation tag to set_urgent()

[Philip Withnall <pwithnall src gnome org>]

commit cea72036e343a725586682df724f4c9c184247ee
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Jan 22 11:24:47 2018 +0000

    gnotification: Add missing deprecation tag to set_urgent()
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=792777

 gio/gnotification.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gio/gnotification.c b/gio/gnotification.c
index 76f813e..9861c04 100644
--- a/gio/gnotification.c
+++ b/gio/gnotification.c
@@ -310,6 +310,8 @@ g_notification_get_priority (GNotification *notification)
  * Deprecated in favor of g_notification_set_priority().
  *
  * Since: 2.40
+ * Deprecated: 2.42: Since 2.42, this has been deprecated in favour of
+ *    g_notification_set_priority().
  */
 void
 g_notification_set_urgent (GNotification *notification,