[w3c/browser-payment-api] Fix two minor typos. (#220)

There is no 'string' type in WebIDL. Instead we should use DOMString.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/220

-- Commit Summary --

  * Fix two minor typos.

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/220.patch
https://github.com/w3c/browser-payment-api/pull/220.diff

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