[w3c/selection-api] chore(tidy): tidy up document (#143)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/pull/143.html" title="Last updated on Jul 13, 2021, 9:17 AM UTC (3280aad)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/143/49b4527...3280aad.html" title="Last updated on Jul 13, 2021, 9:17 AM UTC (3280aad)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/143

-- Commit Summary --

  * Tidied up document using tidy-html5

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/selection-api/pull/143.patch
https://github.com/w3c/selection-api/pull/143.diff

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