[w3c/payment-request] Editorial: Add [[handler]] slot to PaymentRequest (#909)

Disambiguate that the the handler is only set once, and that a user cannot select a different one.

closes #904

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/909

-- Commit Summary --

  * Editorial: Add [[handler]] slot to PaymentRequest

-- File Changes --

    M index.html (29)

-- Patch Links --

https://github.com/w3c/payment-request/pull/909.patch
https://github.com/w3c/payment-request/pull/909.diff

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