[w3c/payment-request] chore(tidy): tidy up document (#970)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/970

-- Commit Summary --

  * <a href="https://github.com/w3c/payment-request/pull/970/commits/3dec2e23a54fec861cbdce4d8209f7e5d4f2d8b0">Tidied up document using tidy-html5</a>

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-request/pull/970.patch
https://github.com/w3c/payment-request/pull/970.diff

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