docs: reformat man pages to improve consistency and readability

Change-Id: I4f9afbc73c365dfa31eb6cd1e4a48368b6a9064f
diff --git a/docs/manpages.rst b/docs/manpages.rst
index 3804626..d097323 100644
--- a/docs/manpages.rst
+++ b/docs/manpages.rst
@@ -15,8 +15,8 @@
    manpages/nfd-status
    manpages/nfd-status-http-server
    schema
+   manpages/nfd-autoreg
    manpages/ndn-autoconfig
    manpages/ndn-autoconfig.conf
    manpages/ndn-autoconfig-server
    local-prefix-discovery
-   manpages/nfd-autoreg