DOCSP-33943: mention dns seedlist default tls setting (#481)

* DOCSP-33943: mention dns seedlist default tls setting

(cherry picked from commit f7ac2f8)

Author: Chris Cho

source/fundamentals/connection/tls.txt

@@ -37,6 +37,17 @@ You can enable TLS/SSL for the connection to your MongoDB instance
 in two different ways: through a parameter in your connection string, or
 using a method in the ``MongoClientSettings.Builder`` class.
 
+.. note::
+
+   If you connect by using the DNS seedlist protocol, indicated by the
+   ``mongodb+srv`` prefix in your connection string, the driver enables
+   TLS/SSL. To disable it, set the ``tls`` or ``ssl`` parameter value to
+   ``false`` in your connection string or ``MongoClientSettings`` instance.
+
+   To learn more about connection behavior when you use a DNS seedlist,
+   see the :manual:`SRV Connection Format </reference/connection-string/#std-label-connections-dns-seedlist>`
+   section in the Server manual.
+
 .. tabs::
 
    .. tab:: ConnectionString