Underline that the Basic scheme requires a secure transport

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@@ -670,6 +670,13 @@ <h2>Security</h2>
             A Thing MAY implement multiple security schemes, at least one of the above MUST be supported.</span>
         </p>
 
+        <p>
+            The <a href="https://w3c.github.io/wot-thing-description/#basicsecurityscheme">
+                <code>BasicSecurityScheme</code>
+            </a> SHOULD be avoided if the underlying transport is not
+            <a href="https://w3c.github.io/wot-architecture/#sec-security-consideration-secure-transport">secure</a>.
+        </p>
+
         <p><span class="rfc2119-assertion" id="common-constraints-security-6">
           Conformant Consumers MUST support security bootstrapping for all
           implemented security schemes, as defined in