[w3c/screen-orientation] Tidied up document using tidy-html5 (#203)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/screen-orientation/pull/203.html" title="Last updated on Jun 17, 2021, 1:34 AM UTC (5ffb178)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/screen-orientation/203/05f6efb...5ffb178.html" title="Last updated on Jun 17, 2021, 1:34 AM UTC (5ffb178)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/screen-orientation/pull/203

-- Commit Summary --

  * chore(tidy): tidy up document

-- File Changes --

    M index.html (118)

-- Patch Links --

https://github.com/w3c/screen-orientation/pull/203.patch
https://github.com/w3c/screen-orientation/pull/203.diff

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