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/zipfile.rst b/Doc/library/zipfile.rst
index 51240ba..30a0361 100644
--- a/Doc/library/zipfile.rst
+++ b/Doc/library/zipfile.rst
@@ -1,4 +1,3 @@
-
:mod:`zipfile` --- Work with ZIP archives
=========================================
@@ -9,6 +8,10 @@
.. versionadded:: 1.6
+**Source code:** :source:`Lib/zipfile.py`
+
+--------------
+
The ZIP file format is a common archive and compression standard. This module
provides tools to create, read, write, append, and list a ZIP file. Any
advanced use of this module will require an understanding of the format, as