Fix RFC number.

Doc/lib/libcookielib.tex

@@ -24,7 +24,7 @@ Internet are Netscape cookies.  \module{cookielib} attempts to follow
 the de-facto Netscape cookie protocol (which differs substantially
 from that set out in the original Netscape specification), including
 taking note of the \code{max-age} and \code{port} cookie-attributes
-introduced with RFC 2109.  \note{The various named parameters found in
+introduced with RFC 2965.  \note{The various named parameters found in
 \mailheader{Set-Cookie} and \mailheader{Set-Cookie2} headers
 (eg. \code{domain} and \code{expires}) are conventionally referred to
 as \dfn{attributes}.  To distinguish them from Python attributes, the