docs: Use only major version in python.org URL

docs/changelog.rst

@@ -103,7 +103,7 @@ Changed
 ~~~~~~~
 
 -  The collision behavior is changed to always warn.
--  Remove the ``collision_behavior`` argument. Use a `warning filter <https://docs.python.org/3.8/library/warnings.html>`__ instead.
+-  Remove the ``collision_behavior`` argument. Use a `warning filter <https://docs.python.org/3/library/warnings.html>`__ instead.
 -  Add ``path`` and ``id`` properties to ``DuplicateIdValueWarning`` to store the ``path`` at which, and the ``id`` on which, the collision occurred.
 
 0.5.10.post2 (2019-11-22)
@@ -142,7 +142,7 @@ Changed
 -  Warn if multiple objects in an array have the same ``id`` value.
 -  Add a ``collision_behavior`` argument to ``merge``, ``merge_versioned``, ``add_release_to_compiled_release`` and ``add_release_to_versioned_release``, which can be set to:
 
-   -  ``ocdsmerge.WARN``: issue a ``DuplicateIdValueWarning`` `warning <https://docs.python.org/3.8/library/warnings.html>`__ (default)
+   -  ``ocdsmerge.WARN``: issue a ``DuplicateIdValueWarning`` `warning <https://docs.python.org/3/library/warnings.html>`__ (default)
    -  ``ocdsmerge.RAISE``: raise a ``DuplicateIdValueError`` exception
    -  ``ocdsmerge.IGNORE``: silently ignore the collision
 

docs/handle-bad-data.rst

@@ -5,7 +5,7 @@ The merge routine merges multiple individual releases into either a compiled rel
 
 However, if objects that correspond to different things re-use ``id`` values, then only the last object is retained in the merged release, by default. (To be clear, such data has structural errors.) For example, if a publisher creates a release for each award notice in a procurement procedure, and restarts the numbering of award objects in each release from '1', then the later releases will overwrite the award objects of the earlier releases.
 
-Similarly, if, in a single release, objects in the same array share an ``id`` value, then only the last object is retained. If so, this package issues a :code:`DuplicateIdValueWarning` warning. You can turn the warning into an exception or ignore the warning using a `warning filter <https://docs.python.org/3.8/library/warnings.html>`__. For example:
+Similarly, if, in a single release, objects in the same array share an ``id`` value, then only the last object is retained. If so, this package issues a :code:`DuplicateIdValueWarning` warning. You can turn the warning into an exception or ignore the warning using a `warning filter <https://docs.python.org/3/library/warnings.html>`__. For example:
 
 .. code-block:: python