[w3c/payment-request] Editorial to address #675 (#683)

* Create single section for sec enhancements
* Move one of them from above and link to it
* Combine with existing bits about handler matching

To address issue #675 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/683

-- Commit Summary --

  * https://github.com/w3c/payment-request/issues/675

-- File Changes --

    M index.html (56)

-- Patch Links --

https://github.com/w3c/payment-request/pull/683.patch
https://github.com/w3c/payment-request/pull/683.diff

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