restructured library manual accordiung to functional group
diff --git a/Doc/lib/libimp.tex b/Doc/lib/libimp.tex
index 91e250b..f995979 100644
--- a/Doc/lib/libimp.tex
+++ b/Doc/lib/libimp.tex
@@ -51,7 +51,7 @@
\code{None} is returned. (Frozen modules are modules written in
Python whose compiled byte-code object is incorporated into a
custom-built Python interpreter by Python's \code{freeze} utility.
-See \code{Demo/freeze} for now.)
+See \code{Tools/freeze} for now.)
\end{funcdesc}
\begin{funcdesc}{is_builtin}{name}