[w3c/payment-request] Editorial: fixup updateWith() example (#667)

Remove mention of non-existent [[updatedUI]] internal slot. Simplify language a little bit. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/667

-- Commit Summary --

  * Editorial: fixup updateWith() example

-- File Changes --

    M index.html (11)

-- Patch Links --

https://github.com/w3c/payment-request/pull/667.patch
https://github.com/w3c/payment-request/pull/667.diff

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