Updating References in the note on transitive trust (#868)

Author: shigeya

index.html

@@ -2231,9 +2231,9 @@ <h3>Trust Model</h3>
 directly trusts or does not trust an <a>issuer</a>. While it is possible to
 build transitive trust models using the Verifiable Credentials Data Model,
 implementers are urged to
-<a href="https://datatracker.ietf.org/doc/draft-housley-web-pki-problems/">learn
+<a href="https://datatracker.ietf.org/doc/draft-iab-web-pki-problems/">learn
 about the security weaknesses</a> introduced by
-<a href="https://www.cs.cornell.edu/people/egs/papers/dnssurvey.pdf">broadly
+<a href="https://www.usenix.org/conference/imc-05/perils-transitive-trust-domain-name-system">broadly
 delegating trust</a> in the manner adopted by Certificate Authority systems.
         </p>
       </section>