tools: nfdc help command

refs #3780

Change-Id: Ibd0e37bad127a38e582864fadd81afadc74baf48
diff --git a/docs/manpages.rst b/docs/manpages.rst
index 7207f34..0dd78eb 100644
--- a/docs/manpages.rst
+++ b/docs/manpages.rst
@@ -6,6 +6,10 @@
 .. toctree::
    manpages/nfd
    manpages/nfdc
+   manpages/nfdc-status
+   manpages/nfdc-face
+   manpages/nfdc-route
+   manpages/nfdc-strategy
    manpages/nfd-status
    schema
    manpages/nfd-status-http-server