[w3c/payment-handler] Added more security implementation notes from Rouslan; non-normative (#320)

Non-normative change based on @rsolomakhin conversation.


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

  https://github.com/w3c/payment-handler/pull/320

-- Commit Summary --

  * Added more security implementation notes from Rouslan; non-normative

-- File Changes --

    M index.html (23)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/320.patch
https://github.com/w3c/payment-handler/pull/320.diff

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