Prefer intersphinx to hardcoded importlib links

Author: abravalheri

docs/pkg_resources.rst

@@ -12,10 +12,8 @@ packages.
 
 .. attention::
    Use of ``pkg_resources`` is deprecated in favor of
-   `importlib.resources <https://docs.python.org/3/library/importlib.resources.html#module-importlib.resources>`_,
-   `importlib.metadata <https://docs.python.org/3/library/importlib.metadata.html>`_,
-   and their backports (:pypi:`importlib_resources`,
-   :pypi:`importlib_metadata`).
+   :mod:`importlib.resources`, :mod:`importlib.metadata`
+   and their backports (:pypi:`importlib_resources`, :pypi:`importlib_metadata`).
    Users should refrain from new usage of ``pkg_resources`` and
    should work to port to importlib-based solutions.