Add missing source links.

Doc/library/__future__.rst

@@ -4,6 +4,9 @@
 .. module:: __future__
    :synopsis: Future statement definitions
 
+**Source code:** :source:`Lib/__future__.py`
+
+--------------
 
 :mod:`__future__` is a real module, and serves three purposes:
 

Doc/library/_dummy_thread.rst

@@ -4,6 +4,9 @@
 .. module:: _dummy_thread
    :synopsis: Drop-in replacement for the _thread module.
 
+**Source code:** :source:`Lib/_dummy_thread.py`
+
+--------------
 
 This module provides a duplicate interface to the :mod:`_thread` module.  It is
 meant to be imported when the :mod:`_thread` module is not provided on a

Doc/library/xml.dom.minidom.rst

@@ -7,6 +7,9 @@
 .. sectionauthor:: Paul Prescod <paul@prescod.net>
 .. sectionauthor:: Martin v. Löwis <martin@v.loewis.de>
 
+**Source code:** :source:`Lib/xml/dom/minidom.py`
+
+--------------
 
 :mod:`xml.dom.minidom` is a light-weight implementation of the Document Object
 Model interface.  It is intended to be simpler than the full DOM and also

Doc/library/xml.dom.pulldom.rst

@@ -5,6 +5,9 @@
    :synopsis: Support for building partial DOM trees from SAX events.
 .. moduleauthor:: Paul Prescod <paul@prescod.net>
 
+**Source code:** :source:`Lib/xml/dom/pulldom.py`
+
+--------------
 
 :mod:`xml.dom.pulldom` allows building only selected portions of a Document
 Object Model representation of a document from SAX events.

Doc/library/xml.etree.elementtree.rst

@@ -5,6 +5,9 @@
    :synopsis: Implementation of the ElementTree API.
 .. moduleauthor:: Fredrik Lundh <fredrik@pythonware.com>
 
+**Source code:** :source:`Lib/xml/etree/ElementTree.py`
+
+--------------
 
 The :class:`Element` type is a flexible container object, designed to store
 hierarchical data structures in memory.  The type can be described as a cross

Doc/library/xmlrpc.client.rst

@@ -10,6 +10,10 @@
 .. XXX Not everything is documented yet.  It might be good to describe
    Marshaller, Unmarshaller, getparser, dumps, loads, and Transport.
 
+**Source code:** :source:`Lib/xmlrpc/client.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

Doc/library/xmlrpc.server.rst

@@ -6,6 +6,9 @@
 .. moduleauthor:: Brian Quinlan <brianq@activestate.com>
 .. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
 
+**Source code:** :source:`Lib/xmlrpc/server.py`
+
+--------------
 
 The :mod:`xmlrpc.server` module provides a basic server framework for XML-RPC
 servers written in Python.  Servers can either be free standing, using