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/xmlrpclib.rst b/Doc/library/xmlrpclib.rst
index 02011e8..320e019 100644
--- a/Doc/library/xmlrpclib.rst
+++ b/Doc/library/xmlrpclib.rst
@@ -17,6 +17,10 @@
.. versionadded:: 2.2
+**Source code:** :source:`Lib/xmlrpclib.py`
+
+--------------
+
XML-RPC is a Remote Procedure Call method that uses XML passed via HTTP as a
transport. With it, a client can call methods with parameters on a remote
server (the server is named by a URI) and get back structured data. This module