Fix pytest.org link in docs

docs/topics/development/testing.rst

@@ -178,9 +178,9 @@ need to recompile the .mo files manually, for example::
 
 .. _`Django's Unit Testing`: http://docs.djangoproject.com/en/dev/topics/testing
 .. _`PyPom`: http://pypom.readthedocs.io/en/latest/
-.. _`pytest`: http://pytest.org/latest/
+.. _`pytest`: http://pytest.org/
 .. _`pytest-django`: https://pytest-django.readthedocs.io/en/latest/
 .. _`Selenium`: http://www.seleniumhq.org/
 .. _`Selenium repository`: https://github.com/mozilla/Addon-Tests/
 .. _mock: http://pypi.python.org/pypi/mock
-.. _fixtures: http://pytest.org/latest/fixture.html
+.. _fixtures: http://pytest.org/en/latest/fixture.html

docs/topics/development/tests.rst

@@ -38,6 +38,6 @@ run using different methods:
 
 For more, see the `Pytest usage documentation`_.
 
-.. _marked: http://pytest.org/latest/mark.html
+.. _marked: http://pytest.org/en/latest/mark.html
 .. _Pytest usage documentation:
-    http://pytest.org/latest/usage.html#specifying-tests-selecting-tests
+    http://pytest.org/en/latest/usage.html#specifying-tests-selecting-tests

docs/topics/install/deprecated/elasticsearch.rst

@@ -104,7 +104,7 @@ or
 
     make test_es
 
-.. _pytest: http://pytest.org/latest/
+.. _pytest: http://pytest.org/
 
 
 Troubleshooting