Fix reference (follow-up to #9061)

Doc/library/cgi.rst

@@ -329,7 +329,7 @@ algorithms implemented in this module in other circumstances.
    that single quotes are never translated.
 
    If the value to be quoted might include single- or double-quote characters,
-   or both, consider using the :func:`quoteattr` function in the
+   or both, consider using the :func:`~xml.sax.saxutil.quoteattr` function in the
    :mod:`xml.sax.saxutils` module instead.