Issue #26199: Fix broken link in unittest.mock-examples.rst

Patch by Raphael Das Gupta.

Doc/library/unittest.mock-examples.rst

@@ -1254,4 +1254,4 @@ As of version 1.5, the Python testing library `PyHamcrest
 <https://pypi.python.org/pypi/PyHamcrest>`_ provides similar functionality,
 that may be useful here, in the form of its equality matcher
 (`hamcrest.library.integration.match_equality
-<http://pythonhosted.org/PyHamcrest/integration.html#hamcrest.library.integration.match_equality.match_equality>`_).
+<http://pyhamcrest.readthedocs.org/en/stable/integration/#module-hamcrest.library.integration.match_equality>`_).