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/py_compile.rst b/Doc/library/py_compile.rst
index ca86143..66f015b 100644
--- a/Doc/library/py_compile.rst
+++ b/Doc/library/py_compile.rst
@@ -8,6 +8,10 @@
.. index:: pair: file; byte-code
+**Source code:** :source:`Lib/py_compile.py`
+
+--------------
+
The :mod:`py_compile` module provides a function to generate a byte-code file
from a source file, and another function used when the module source file is
invoked as a script.