Update setup-auto-dns.rst

For me it has been unclear if prot 53 may not be in use in cobination to 127.0.0.1 or generally.
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@ -53,7 +53,7 @@ Then you need to ensure that :ref:`env_host_port_bind` is set to ``53``.
host> vi .env
HOST_PORT_BIND=53
Before starting up the Devilbox, ensure that port ``53`` is not already used on ``127.0.0.1``.
Before starting up the Devilbox, ensure that port ``53`` is not already used.
.. code-block:: bash
:emphasize-lines: 2