docs: update README and add RELEASE NOTES

Change-Id: Ifb79bda4d8cddc8002e244a090723c284c49a2c9
Refs: #1439
diff --git a/docs/manpages.rst b/docs/manpages.rst
index 5e1530b..3b8a496 100644
--- a/docs/manpages.rst
+++ b/docs/manpages.rst
@@ -1,5 +1,7 @@
-NFD Manpages
-============
+.. _Manpages:
+
+Manpages
+========
 
 .. toctree::
    manpages/nfd