[w3c/payment-request] editorial: add example of .toJSON()+fetch POST (#583)

* closes #576
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/583

-- Commit Summary --

  * editorial: add example of .toJSON()+fetch POST

-- File Changes --

    M index.html (32)

-- Patch Links --

https://github.com/w3c/payment-request/pull/583.patch
https://github.com/w3c/payment-request/pull/583.diff

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