[w3c/browser-payment-api] style(index.html): cleanup markup (#392)

Fix ReSpec warnings, etc. No content changes - just markup fixes.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/392

-- Commit Summary --

  * style(index.html): cleanup markup
  * chore: fix ReSpec warnings/xrefs

-- File Changes --

    M index.html (457)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/392.patch
https://github.com/w3c/browser-payment-api/pull/392.diff

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https://github.com/w3c/browser-payment-api/pull/392