[w3c/pointerlock] improve markup language (#37)

to fix the [markup errors](https://validator.w3.org/nu/?doc=https%3A%2F%2Flabs.w3.org%2Fspec-generator%2F%3Ftype%3Drespec%26url%3Dhttp%253A%252F%252Fw3c.github.io%252Fpointerlock%252Findex.html%253FspecStatus%253DWD%253BshortName%253Dpointerlock) reported by the validator.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/pointerlock/pull/37

-- Commit Summary --

  * improve markup language

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/pointerlock/pull/37.patch
https://github.com/w3c/pointerlock/pull/37.diff

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https://github.com/w3c/pointerlock/pull/37