[w3c/payment-request] Informative note about role of id attribute (#913)

closes #911 

The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec errors/warnings.
 * [ ] Has undergone security/privacy review (link)

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

  https://github.com/w3c/payment-request/pull/913

-- Commit Summary --

  * Informative note per

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/payment-request/pull/913.patch
https://github.com/w3c/payment-request/pull/913.diff

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