[3.1.x] Fixed #31643 -- Changed virtualenv doc references to Python 3 venv.

Backport of 9f4ceee90a from master

docs/howto/deployment/wsgi/modwsgi.txt

@@ -48,9 +48,9 @@ your project package (``mysite`` in this example). This tells Apache to serve
 any request below the given URL using the WSGI application defined in that
 file.
 
-If you install your project's Python dependencies inside a `virtualenv`_, add
-the path to the virtualenv using ``WSGIPythonHome``. See the `mod_wsgi
-virtualenv guide`_ for more details.
+If you install your project's Python dependencies inside a :mod:`virtual
+environment <venv>`, add the path using ``WSGIPythonHome``. See the `mod_wsgi
+virtual environment guide`_ for more details.
 
 The ``WSGIPythonPath`` line ensures that your project package is available for
 import on the Python path; in other words, that ``import mysite`` works.
@@ -64,8 +64,7 @@ for you; otherwise, you'll need to create it. See the :doc:`WSGI overview
 documentation</howto/deployment/wsgi/index>` for the default contents you
 should put in this file, and what else you can add to it.
 
-.. _virtualenv: https://virtualenv.pypa.io/
-.. _mod_wsgi virtualenv guide: https://modwsgi.readthedocs.io/en/develop/user-guides/virtual-environments.html
+.. _mod_wsgi virtual environment guide: https://modwsgi.readthedocs.io/en/develop/user-guides/virtual-environments.html
 
 .. warning::
 

docs/howto/deployment/wsgi/uwsgi.txt

@@ -60,7 +60,7 @@ Here's an example command to start a uWSGI server::
         --harakiri=20 \                 # respawn processes taking more than 20 seconds
         --max-requests=5000 \           # respawn processes after serving 5000 requests
         --vacuum \                      # clear environment on exit
-        --home=/path/to/virtual/env \   # optional path to a virtualenv
+        --home=/path/to/virtual/env \   # optional path to a virtual environment
         --daemonize=/var/log/uwsgi/yourproject.log      # background the process
 
 This assumes you have a top-level project package named ``mysite``, and
@@ -78,7 +78,7 @@ The Django-specific options here are:
 * ``module``: The WSGI module to use -- probably the ``mysite.wsgi`` module
   that :djadmin:`startproject` creates.
 * ``env``: Should probably contain at least :envvar:`DJANGO_SETTINGS_MODULE`.
-* ``home``: Optional path to your project virtualenv.
+* ``home``: Optional path to your project virtual environment.
 
 Example ini configuration file::
 

docs/howto/upgrade-version.txt

@@ -87,8 +87,9 @@ Installation
 ============
 
 Once you're ready, it is time to :doc:`install the new Django version
-</topics/install>`. If you are using virtualenv_ and it is a major upgrade, you
-might want to set up a new environment with all the dependencies first.
+</topics/install>`. If you are using a :mod:`virtual environment <venv>` and it
+is a major upgrade, you might want to set up a new environment with all the
+dependencies first.
 
 If you installed Django with pip_, you can use the ``--upgrade`` or ``-U`` flag:
 
@@ -97,7 +98,6 @@ If you installed Django with pip_, you can use the ``--upgrade`` or ``-U`` flag:
    $ python -m pip install -U Django
 
 .. _pip: https://pip.pypa.io/
-.. _virtualenv: https://virtualenv.pypa.io/
 
 Testing
 =======