[w3c/payment-request] Editorial: reworded examples, nits (#827)

Doing a final editorial pass in preparing for finishing this...
 
 * Fixed up some examples and their headings
 * removed Features at Risk (no more features at risk). 
 * removed a stray issue
 * fixed some small nits 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/827

-- Commit Summary --

  * Editorial: reworded examples, nits

-- File Changes --

    M index.html (112)

-- Patch Links --

https://github.com/w3c/payment-request/pull/827.patch
https://github.com/w3c/payment-request/pull/827.diff

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