[w3c/selection-api] Fix typo (#142)

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

  https://github.com/w3c/selection-api/pull/142

-- Commit Summary --

  * Fix typo

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/selection-api/pull/142.patch
https://github.com/w3c/selection-api/pull/142.diff

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