[w3c/browser-payment-api] Editorial fixes and xrefs (#422)

* removes terms that were defined but never used.
* now links to ES6 spec for various things
* drops "secure context" that's no longer needed 
*  links to WebIDL for "converting"
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/422

-- Commit Summary --

  * editorial: remove note about secure context
  * editorial: drop redefinition of secure context
  * editorial: remove dfn 'extended attribute', was never used
  * editorial: link ES6 things to ECMA-262-2015
  * editorial: remove JSON.parse, defined but never used
  * editorial: remove dfn for node document, never used
  * editorial: shippingaddresschange is a string, not dfn
  * editorial: converting a dictionary to an ECMAScript value defined but never used
  * editorial: link 'converting' to WebIDL definition

-- File Changes --

    M index.html (39)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/422.patch
https://github.com/w3c/browser-payment-api/pull/422.diff

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