[w3c/browser-payment-api] Reference HTML for allowpaymentrequest definition (#359)

Following https://github.com/whatwg/html/pull/2133, which adds the definition of the `<iframe>` `allowpaymentrequest` attribute to the HTML spec, this change updates the Payment Request API to reference HTML for that definition of `allowpaymentrequest` from HTML.

See also https://github.com/w3c/browser-payment-api/issues/311
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/359

-- Commit Summary --

  * Reference HTML for allowpaymentrequest definition

-- File Changes --

    M index.html (59)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/359.patch
https://github.com/w3c/browser-payment-api/pull/359.diff

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