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/gzip.rst b/Doc/library/gzip.rst
index 037909b..e074bfc 100644
--- a/Doc/library/gzip.rst
+++ b/Doc/library/gzip.rst
@@ -4,6 +4,10 @@
.. module:: gzip
:synopsis: Interfaces for gzip compression and decompression using file objects.
+**Source code:** :source:`Lib/gzip.py`
+
+--------------
+
This module provides a simple interface to compress and decompress files just
like the GNU programs :program:`gzip` and :program:`gunzip` would.