[w3c/payment-request] editorial: rework PaymentDetailsUpdate.error member (#845)

closes #840

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 

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

  https://github.com/w3c/payment-request/pull/845

-- Commit Summary --

  * editorial: rework PaymentDetailsUpdate.error member

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/payment-request/pull/845.patch
https://github.com/w3c/payment-request/pull/845.diff

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