[w3c/screen-orientation] Tidied up document using tidy-html5 (PR #212)

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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/screen-orientation/pull/212

-- Commit Summary --

  * chore(tidy): tidy up document

-- File Changes --

    M index.html (23)

-- Patch Links --

https://github.com/w3c/screen-orientation/pull/212.patch
https://github.com/w3c/screen-orientation/pull/212.diff

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