Issue #22558: Add remaining doc links to source code for Python-coded modules.
Reformat header above separator line (added if missing) to a common format.
Patch by Yoni Lavi.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 8482f20..0fc02c4 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -3,11 +3,16 @@
 
 .. module:: unittest
    :synopsis: Unit testing framework for Python.
+
 .. moduleauthor:: Steve Purcell <stephen_purcell@yahoo.com>
 .. sectionauthor:: Steve Purcell <stephen_purcell@yahoo.com>
 .. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
 .. sectionauthor:: Raymond Hettinger <python@rcn.com>
 
+**Source code:** :source:`Lib/unittest/__init__.py`
+
+--------------
+
 (If you are already familiar with the basic concepts of testing, you might want
 to skip to :ref:`the list of assert methods <assert-methods>`.)