[w3c/payment-request] Chore: Minor link fix (#619)

Use data-cite rather than href
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/619

-- Commit Summary --

  * Minor bug fix (data-cite)

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-request/pull/619.patch
https://github.com/w3c/payment-request/pull/619.diff

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