Use :rfc: and :abbr: sphinx roles

Change-Id: I34e0ddbd644944d98a26f9c0c93ad787b4d93679
diff --git a/name.rst b/name.rst
index 0db53cd..d018701 100644
--- a/name.rst
+++ b/name.rst
@@ -51,7 +51,7 @@
 ~~~~~~~~~~~~~~
 
 For textual representation, it is often convenient to use URI to represent NDN names.
-Please refer to RFC 3986 (URI Generic Syntax) for background.
+Please refer to :rfc:`3986` (URI Generic Syntax) for background.
 
 The scheme identifier is ``ndn``.