Backport source links from 3.x.
Existing links have been updated to use the new reST role. In some
files, I have also made cosmetic changes to the header.
diff --git a/Doc/library/token.rst b/Doc/library/token.rst
index 00972b0..4b98eac 100644
--- a/Doc/library/token.rst
+++ b/Doc/library/token.rst
@@ -1,4 +1,3 @@
-
:mod:`token` --- Constants used with Python parse trees
=======================================================
@@ -6,6 +5,9 @@
:synopsis: Constants representing terminal nodes of the parse tree.
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
+**Source code:** :source:`Lib/token.py`
+
+--------------
This module provides constants which represent the numeric values of leaf nodes
of the parse tree (terminal tokens). Refer to the file :file:`Grammar/Grammar`