[w3c/payment-handler] Clarify empty instrument key meaning. (#208)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/208

-- Commit Summary --

  * Clarify empty instrument key meaning.

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/208.patch
https://github.com/w3c/payment-handler/pull/208.diff

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