[w3c/payment-request] editorial: clarify currency member is alphabetic code (#587)

* closes #585
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/587

-- Commit Summary --

  * editorial: clarify currency mem is alphabetic code

-- File Changes --

    M index.html (11)

-- Patch Links --

https://github.com/w3c/payment-request/pull/587.patch
https://github.com/w3c/payment-request/pull/587.diff

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