[w3c/payment-request] Add privacy notice regarding data usage (#869)

closes #868 

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 * [ ] Has undergone security/privacy review (link)
 
Non-normative; no implementation 

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

  https://github.com/w3c/payment-request/pull/869

-- Commit Summary --

  * Add privacy notice regarding data usage based on

-- File Changes --

    M index.html (15)

-- Patch Links --

https://github.com/w3c/payment-request/pull/869.patch
https://github.com/w3c/payment-request/pull/869.diff

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