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

Change-Id: If000753573c6a50130dc3101a411b6d482ccf3ed
diff --git a/docs/examples.rst b/docs/examples.rst
index 08b3bdb..a778b25 100644
--- a/docs/examples.rst
+++ b/docs/examples.rst
@@ -5,7 +5,7 @@
 
     To successfully run the following examples, please make sure that NFD is properly
     configured and running.  For more information about NFD, refer to `NFD's official
-    homepage <https://named-data.net/doc/NFD/>`_.
+    homepage <https://docs.named-data.net/NFD/>`__.
 
 Trivial consumer
 ----------------