Use intersphinx references

Author: dukecat0

source/guides/index-mirrors-and-caches.rst

@@ -34,8 +34,7 @@ cached copies of :term:`packages <Distribution Package>`:
    by downloading all the requirements for a project and then pointing pip at
    those downloaded files instead of going to PyPI.
 2. A variation on the above which pre-builds the installation files for
-   the requirements using `python -m pip wheel
-   <https://pip.pypa.io/en/latest/cli/pip_wheel/>`_:
+   the requirements using :ref:`python -m pip wheel <pip wheel>`:
 
    .. code-block:: bash