[4.2.x] Refs #31626 -- Noted that Daphne provides a runserver command.

Backport of 279e611c01 from main

docs/howto/deployment/asgi/daphne.txt

@@ -33,3 +33,22 @@ For a typical Django project, invoking Daphne would look like:
 This will start one process listening on ``127.0.0.1:8000``. It requires that
 your project be on the Python path; to ensure that run this command from the
 same directory as your ``manage.py`` file.
+
+.. _daphne-runserver:
+
+Integration with ``runserver``
+==============================
+
+Daphne provides a :djadmin:`runserver` command to serve your site under ASGI
+during development.
+
+This can be enabled by adding ``daphne`` to the start of your
+:setting:`INSTALLED_APPS` and adding an ``ASGI_APPLICATION`` setting pointing
+to your ASGI application object::
+
+    INSTALLED_APPS = [
+        "daphne",
+        ...,
+    ]
+
+    ASGI_APPLICATION = "myproject.asgi.application"