[w3c/webpayments] Use notes and issues more consistently (#144)

Also assed issues 142, 143 to the issues list:
https://github.com/w3c/webpayments/issues
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments/pull/144

-- Commit Summary --

  * Merge remote-tracking branch 'w3c/gh-pages' into gh-pages
  * More harmonized use of notes and issues

-- File Changes --

    M proposals/paymentapps/payment-apps.html (50)

-- Patch Links --

https://github.com/w3c/webpayments/pull/144.patch
https://github.com/w3c/webpayments/pull/144.diff

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