[w3c/selection-api] chore(tidy): tidy up document (#140)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/pull/140.html" title="Last updated on Jun 11, 2021, 9:51 AM UTC (bab03a9)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/140/694f233...bab03a9.html" title="Last updated on Jun 11, 2021, 9:51 AM UTC (bab03a9)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/140

-- Commit Summary --

  * Tidied up document using tidy-html5

-- File Changes --

    M index.html (117)

-- Patch Links --

https://github.com/w3c/selection-api/pull/140.patch
https://github.com/w3c/selection-api/pull/140.diff

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