Add references to the documentation for the Python documentation markup.
Suggested by the comments in SF bug #430627.
diff --git a/Doc/templates/manual.tex b/Doc/templates/manual.tex
index a8c8ec2..e1114d6 100644
--- a/Doc/templates/manual.tex
+++ b/Doc/templates/manual.tex
@@ -1,3 +1,10 @@
+% Complete documentation on the extended LaTeX markup used for Python
+% documentation is available in ``Documenting Python'', which is part
+% of the standard documentation for Python. It may be found online
+% at:
+%
+% http://www.python.org/doc/current/doc/doc.html
+
\documentclass{manual}
\title{Big Python Manual}