[w3c/payment-handler] Security addition (#214)

As discussed during 5 September task force call: it is ok for user agents to not display a (matching) payment app due to security reasons.

(Also some tidying happening here of previous merged pull request about payment instruments from Rouslan.)

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

  https://github.com/w3c/payment-handler/pull/214

-- Commit Summary --

  * Added to security section on authenticity licensing

-- File Changes --

    M index.html (11)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/214.patch
https://github.com/w3c/payment-handler/pull/214.diff

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