[w3c/browser-payment-api] Tidy up document (#297)

This tidies up the document markup, based on tidyconfig.txt. 

Makes it much easier to track changes, etc. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/297

-- Commit Summary --

  * chore: fix xrefs and dfns
  * chore: tidy markup

-- File Changes --

    M index.html (3392)
    A tidyconfig.txt (4)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/297.patch
https://github.com/w3c/browser-payment-api/pull/297.diff

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