[w3c/payment-request] document show() protections under security considerations (#740)

Part of
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/740

-- Commit Summary --

  * document show() protections under security considerations, part of

-- File Changes --

    M index.html (16)

-- Patch Links --

https://github.com/w3c/payment-request/pull/740.patch
https://github.com/w3c/payment-request/pull/740.diff

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