[2.7] bpo-33503: Fix the broken pypi link in the source and the documentation (GH-6814). (GH-6905)

(cherry picked from commit 19177fbd5d6d9b29ccc302d65f9d9417ece082ce)

Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index b36126e..0915926 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -78,7 +78,7 @@
    Module :mod:`doctest`
       Another test-support module with a very different flavor.
 
-   `unittest2: A backport of new unittest features for Python 2.4-2.6 <https://pypi.python.org/pypi/unittest2>`_
+   `unittest2: A backport of new unittest features for Python 2.4-2.6 <https://pypi.org/project/unittest2>`_
       Many new features were added to unittest in Python 2.7, including test
       discovery. unittest2 allows you to use these features with earlier
       versions of Python.