docs: update several URLs to point to docs.named-data.net

Change-Id: If000753573c6a50130dc3101a411b6d482ccf3ed
diff --git a/docs/release-notes/release-notes-0.6.5.rst b/docs/release-notes/release-notes-0.6.5.rst
index ead42d9..6472cf2 100644
--- a/docs/release-notes/release-notes-0.6.5.rst
+++ b/docs/release-notes/release-notes-0.6.5.rst
@@ -7,7 +7,7 @@
 ^^^^^^^^^^^^
 
 - More support for `NDN packet format version 0.3
-  <https://named-data.net/doc/NDN-packet-spec/0.3/>`__ (:issue:`4527`)
+  <https://docs.named-data.net/NDN-packet-spec/0.3/>`__ (:issue:`4527`)
 
   * Stop using ``ChildSelector`` in ``NotificationSubscriber`` (:issue:`4664`)