[w3c/push-api] Tidied up document using tidy-html5 (PR #424)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/push-api/pull/424.html" title="Last updated on Oct 5, 2026, 11:40 AM UTC (5316ac1)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/push-api/424/0f5bfe6...5316ac1.html" title="Last updated on Oct 5, 2026, 11:40 AM UTC (5316ac1)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/424

-- Commit Summary --

  * chore(tidy): tidy up document

-- File Changes --

    M index.html (23)

-- Patch Links --

https://github.com/w3c/push-api/pull/424.patch
https://github.com/w3c/push-api/pull/424.diff

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