[w3c/payment-request] Tidied up document using tidy-html5 (PR #1008)

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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/1008

-- Commit Summary --

  * chore(tidy): tidy up document

-- File Changes --

    M index.html (1)

-- Patch Links --

https://github.com/w3c/payment-request/pull/1008.patch
https://github.com/w3c/payment-request/pull/1008.diff

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