auth dnsproxy: document network ought to be trusted

We are reusing the source UDP port for a very long time. Cannot have people interfere or try to attack us then.
PowerDNS · Aug 27, 2024 · f3e612b · f3e612b
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commit f3e612b
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diff --git a/docs/settings.rst b/docs/settings.rst
@@ -1541,6 +1541,8 @@ Number of receiver (listening) threads to start. See :doc:`performance`.
 
 Recursive DNS server to use for ALIAS lookups and the internal stub resolver. Only one address can be given.
 
+It is assumed that the specified recursive DNS server, and the network path to it, are trusted.
+
 Examples::
 
   resolver=127.0.0.1