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/symbol.rst b/Doc/library/symbol.rst
index 1735276..75a4792 100644
--- a/Doc/library/symbol.rst
+++ b/Doc/library/symbol.rst
@@ -1,4 +1,3 @@
-
:mod:`symbol` --- Constants used with Python parse trees
========================================================
@@ -6,6 +5,9 @@
:synopsis: Constants representing internal nodes of the parse tree.
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
+**Source code:** :source:`Lib/symbol.py`
+
+--------------
This module provides constants which represent the numeric values of internal
nodes of the parse tree. Unlike most Python constants, these use lower-case