Added reference to the multifile module from the "See also" section
in the mimetools documentation.
Suggested by Skip Montanaro <skip@mojam.com>.
diff --git a/Doc/lib/libmimetools.tex b/Doc/lib/libmimetools.tex
index eb469b1..5749cd8 100644
--- a/Doc/lib/libmimetools.tex
+++ b/Doc/lib/libmimetools.tex
@@ -51,6 +51,8 @@
 \begin{seealso}
   \seemodule{rfc822}{Provides the base class for
                      \class{mimetools.Message}.}
+  \seemodule{multifile}{Support for reading files which contain
+                        distinct parts, such as MIME data.}
 \end{seealso}