[w3c/browser-payment-api] Various fixes to updateWith (#372)

- Fixes #348 by using the promises guide terms
- Fixes a bug related to #335 by appropriately iterating over the additionalDisplayItems
- Fixes the algorithm to correctly reset [[waitForUpdate]] / target.[[updating]] / the UI even when the promise is rejected, instead of aborting
- Various phrasing fixes around how to use and access dictionaries

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On top of #368 and should be merged after that. Will clash with #370 so whichever lands first I'll rebase the other.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/372

-- Commit Summary --

  * Minor typographical fixes
  * Various fixes to updateWith

-- File Changes --

    M index.html (706)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/372.patch
https://github.com/w3c/browser-payment-api/pull/372.diff

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