[libnotify] docs: Fix URL to Desktop Notification Spec

[Andre Klapper <aklapper src gnome org>]

commit 80121a3b8c0118535545a9e37cbe4d877b1388a3
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Sep 4 11:59:49 2022 +0200

    docs: Fix URL to Desktop Notification Spec
    
    Fixes #29

 docs/notify-send.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/notify-send.xml b/docs/notify-send.xml
index cab6fe9..5659794 100644
--- a/docs/notify-send.xml
+++ b/docs/notify-send.xml
@@ -133,6 +133,6 @@
   <refsection>
     <info><title>See also</title></info>
 
-    <para>The Desktop Notification Spec on <link 
xlink:href="http://www.galago-project.org/specs/notification/";>http://www.galago-project.org/specs/notification/</link>.</para>
+    <para>The Desktop Notification Spec on <link 
xlink:href="https://specifications.freedesktop.org/notification-spec/";>https://specifications.freedesktop.org/notification-spec/</link>.</para>
   </refsection>
 </refentry>