[w3c/payment-handler] [index.html] Align with Web IDL specification (#343)

This is an automated pull request to align the spec with the latest Web IDL specification.

  Currently the autofix might introduce some awkward code formatting, so please feel free to modify the formatting.

  Please ping `@saschanaz` if you think this PR is invalid or should be enhanced.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/343

-- Commit Summary --

  * [index.html] Align with Web IDL specification

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/343.patch
https://github.com/w3c/payment-handler/pull/343.diff

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