Dead link to Svalbard Treaty on Archive Program Website

There is a dead link on the [Archive Vault](https://archiveprogram.github.com/arctic-vault/) page of the Archive Program website.

The current link points to: https://www.loc.gov/law/help/us-treaties/bevans/m-ust000002-0269.pdf

I don't know what the correct link should be, but I located the treaty in the Library of Congress in [Treaties and Other International Agreements of the United States of America: Volume 2 (Multilateral treaties, 1918-1930)](https://www.loc.gov/item/lltreaties-ustbv002/)

Working link to the treaty page: https://tile.loc.gov/storage-services/service/ll/lltreaties//lltreaties-ustbv002/lltreaties-ustbv002.pdf#page=277

Please advise if there is a better place to post this.

Abra a página Archive Vault e inspecione o link do Svalbard Treaty, que atualmente aponta para o PDF indisponível de loc.gov. Compare-o com o link funcional para o PDF do tratado da Library of Congress fornecido na issue. A tarefa estará concluída quando a página apontar para o tratado funcional e o link abrir com sucesso.

Escrita pelo modelo de indexação a partir do texto da issue.