doc: rename manpage of client.conf to ndn-client.conf

Change-Id: Ic5b12828629f04b4d4fbb3f9ffdc3dd4ae0054d6
Refs: #1967
diff --git a/docs/manpages.rst b/docs/manpages.rst
index b17844d..1a75a14 100644
--- a/docs/manpages.rst
+++ b/docs/manpages.rst
@@ -2,7 +2,7 @@
 ========
 
 .. toctree::
-    manpages/client.conf
+    ndn-client.conf     <manpages/ndn-client.conf>
     manpages/ndnsec
     ndnsec-list         <manpages/ndnsec-list>
     ndnsec-get-default  <manpages/ndnsec-get-default>