[w3c/payment-request] iframe usage security subsection (#741)

Part of issue 675
https://github.com/w3c/payment-request/issues/675
The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec errors/warnings.
 * [ ] Added Web platform tests (link)
 * [ ] added MDN Docs (link)
 * [ ] added MDN [compat data](https://github.com/mdn/browser-compat-data)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)

Impact on Payment Handler spec?

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

  https://github.com/w3c/payment-request/pull/741

-- Commit Summary --

  * iframe usage security subsection based on

-- File Changes --

    M index.html (16)

-- Patch Links --

https://github.com/w3c/payment-request/pull/741.patch
https://github.com/w3c/payment-request/pull/741.diff

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