[w3c/payment-request] chore(tidy): tidy up document (#960)

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/960

-- Commit Summary --

  * Tidied up document using tidy-html5

-- File Changes --

    M index.html (5)

-- Patch Links --

https://github.com/w3c/payment-request/pull/960.patch
https://github.com/w3c/payment-request/pull/960.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/payment-request/pull/960