Clarified which setting causes HttpRequest.get_host() to rely on the HTTP_X_FORWARDED_HOST header.

.. method:: HttpRequest.get_host()

    Returns the originating host of the request using information from

    the ``HTTP_X_FORWARDED_HOST`` (if enabled in the settings) and ``HTTP_HOST``

    headers (in that order). If they don't provide a value, the method

    uses a combination of ``SERVER_NAME`` and ``SERVER_PORT`` as

    Returns the originating host of the request using information from the

    ``HTTP_X_FORWARDED_HOST`` (if :setting:`USE_X_FORWARDED_HOST` is enabled)

    and ``HTTP_HOST`` headers, in that order. If they don't provide a value,

    the method uses a combination of ``SERVER_NAME`` and ``SERVER_PORT`` as

    detailed in :pep:`3333`.

    Example: ``"127.0.0.1:8000"``