Link to docs.python.org instead of docs.python.jp

Author: AA-Turner

tests/roots/test-ext-autodoc/target/partialmethod.py

@@ -4,7 +4,7 @@
 class Cell:
     """An example for partialmethod.
 
-    refs: https://docs.python.jp/3/library/functools.html#functools.partialmethod
+    refs: https://docs.python.org/3/library/functools.html#functools.partialmethod
     """
 
     def set_state(self, state):

tests/test_extensions/test_ext_autodoc.py

@@ -2160,7 +2160,7 @@ def test_partialmethod(app):
         '',
         '   An example for partialmethod.',
         '',
-        '   refs: https://docs.python.jp/3/library/functools.html#functools.partialmethod',
+        '   refs: https://docs.python.org/3/library/functools.html#functools.partialmethod',
         '',
         '',
         '   .. py:method:: Cell.set_alive()',
@@ -2190,7 +2190,7 @@ def test_partialmethod_undoc_members(app):
         '',
         '   An example for partialmethod.',
         '',
-        '   refs: https://docs.python.jp/3/library/functools.html#functools.partialmethod',
+        '   refs: https://docs.python.org/3/library/functools.html#functools.partialmethod',
         '',
         '',
         '   .. py:method:: Cell.set_alive()',