Use intersphinx references

Author: dukecat0

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

@@ -34,7 +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 :ref:`python -m pip wheel <pip wheel>`:
+   the requirements using :ref:`python -m pip wheel <pip:pip wheel>`:
 
    .. code-block:: bash
 

source/tutorials/installing-packages.rst

@@ -298,7 +298,7 @@ Use pip for Installing
 
 :ref:`pip` is the recommended installer.  Below, we'll cover the most common
 usage scenarios. For more detail, see the `pip docs <https://pip.pypa.io>`_,
-which includes a complete :std:doc:`Reference Guide <cli/index>`.
+which includes a complete :doc:`Reference Guide <pip:cli/index>`.
 
 
 Installing from PyPI