Add documentation for new textwrap module.
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index f285dda..70b1c93 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -107,6 +107,7 @@
 \input{libdifflib}
 \input{libfpformat}
 \input{libstringio}
+\input{libtextwrap}
 \input{libcodecs}
 \input{libunicodedata}