[w3c/payment-request] Spread on update (#669)

This builds on https://github.com/w3c/payment-request/pull/668 to allow incremental data updates as proposed in #649. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/669

-- Commit Summary --

  * wip: allow show to take optional promise
  * Editorial: re-jig the wording/ordering
  * Editorial: if, then:
  * fix markup
  * Editorial, fix typos
  * tidy
  * Editorial: fixup updateWith() example (#667)
  * wip: support partial data updates (closes #649)

-- File Changes --

    M index.html (683)

-- Patch Links --

https://github.com/w3c/payment-request/pull/669.patch
https://github.com/w3c/payment-request/pull/669.diff

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