GH-92584: Remove references to Distutils in PYTHONUSERBASE (#108040)

Remove references to Distutils in ``PYTHONUSERBASE``

Author: AA-Turner

Doc/using/cmdline.rst

@@ -811,8 +811,8 @@ conflict.
 
    Defines the :data:`user base directory <site.USER_BASE>`, which is used to
    compute the path of the :data:`user site-packages directory <site.USER_SITE>`
-   and :ref:`Distutils installation paths <inst-alt-install-user>` for
-   ``python setup.py install --user``.
+   and :ref:`installation paths <inst-alt-install-user>` for
+   ``python -m pip install --user``.
 
    .. seealso::
 

Misc/python.man

@@ -592,8 +592,8 @@ works on Mac OS X.
 .IP PYTHONUSERBASE
 Defines the user base directory, which is used to compute the path of the user
 .IR site-packages
-directory and Distutils installation paths for
-.IR "python setup\.py install \-\-user" .
+directory and installation paths for
+.IR "python \-m pip install \-\-user" .
 .IP PYTHONPROFILEIMPORTTIME
 If this environment variable is set to a non-empty string, Python will
 show how long each import takes. This is exactly equivalent to setting