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

Change-Id: Ic5b12828629f04b4d4fbb3f9ffdc3dd4ae0054d6
Refs: #1967
diff --git a/docs/conf.py b/docs/conf.py
index dbf6a2a..4fafc8d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -254,7 +254,7 @@
     ('tutorials/security-validator-config', 'ndnsec-validator.conf',
      'NDN trust validator configuration file', None, 5),
     ('manpages/tlvdump', 'tlvdump',  'Decode structure of TLV encoded buffer', None, 1),
-    ('manpages/client.conf', 'client.conf',  'Configuration file for NDN platform', None, 5),
+    ('manpages/ndn-client.conf', 'ndn-client.conf',  'Configuration file for NDN platform', None, 5),
 ]