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/contextlib.rst b/Doc/library/contextlib.rst
index c435082..610c0b0 100644
--- a/Doc/library/contextlib.rst
+++ b/Doc/library/contextlib.rst
@@ -7,15 +7,14 @@
.. versionadded:: 2.5
+**Source code:** :source:`Lib/contextlib.py`
+
+--------------
+
This module provides utilities for common tasks involving the :keyword:`with`
statement. For more information see also :ref:`typecontextmanager` and
:ref:`context-managers`.
-.. seealso::
-
- Latest version of the `contextlib Python source code
- <http://svn.python.org/view/python/branches/release27-maint/Lib/contextlib.py?view=markup>`_
-
Functions provided: