[w3c/pointerlock] chore(tidy): tidy up document (PR #77)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/pointerlock/pull/77.html" title="Last updated on Nov 15, 2021, 8:25 PM UTC (2cf57b7)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/pointerlock/77/10a885e...2cf57b7.html" title="Last updated on Nov 15, 2021, 8:25 PM UTC (2cf57b7)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/pointerlock/pull/77

-- Commit Summary --

  * Tidied up document using tidy-html5

-- File Changes --

    M index.html (40)

-- Patch Links --

https://github.com/w3c/pointerlock/pull/77.patch
https://github.com/w3c/pointerlock/pull/77.diff

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