Use the new RFC macros wherever RFCs are referenced by number.  No other
changes.
diff --git a/Doc/libmd5.tex b/Doc/libmd5.tex
index d71bacd..4d76b7c 100644
--- a/Doc/libmd5.tex
+++ b/Doc/libmd5.tex
@@ -1,9 +1,10 @@
 \section{Built-in Module \sectcode{md5}}
 \label{module-md5}
+\rfcindex{1321}
 \bimodindex{md5}
 
 This module implements the interface to RSA's MD5 message digest
-algorithm (see also Internet RFC 1321).  Its use is quite
+algorithm (see also Internet \rfc{1321}).  Its use is quite
 straightforward:\ use the \code{md5.new()} to create an md5 object.
 You can now feed this object with arbitrary strings using the
 \code{update()} method, and at any point you can ask it for the