[quota-api] fixing typo (#4)

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

  https://github.com/w3c/quota-api/pull/4

-- Commit Summary --

  * fixing typo

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/quota-api/pull/4.patch
https://github.com/w3c/quota-api/pull/4.diff

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https://github.com/w3c/quota-api/pull/4