Make references to new filecmp module hyperlinks now that there's
documentation.
diff --git a/Doc/lib/libundoc.tex b/Doc/lib/libundoc.tex
index 52219cb..2967cb8 100644
--- a/Doc/lib/libundoc.tex
+++ b/Doc/lib/libundoc.tex
@@ -96,11 +96,11 @@
--- alternate approach to packages
\item[\module{cmp}]
---- File comparison function. Use the newer \module{filecmp} instead.
+--- File comparison function. Use the newer \refmodule{filecmp} instead.
\item[\module{cmpcache}]
--- Caching version of the obsolete \module{cmp} module. Use the
-newer \module{filecmp} instead.
+newer \refmodule{filecmp} instead.
\item[\module{codehack}]
--- Extract function name or line number from a function