[w3c/permissions] Fix typo (#251)

Trivial typo fix


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<a href="https://pr-preview.s3.amazonaws.com/tomayac/permissions/pull/251.html" title="Last updated on Jul 20, 2021, 8:14 AM UTC (ab81d95)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/251/3769425...tomayac:ab81d95.html" title="Last updated on Jul 20, 2021, 8:14 AM UTC (ab81d95)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/251

-- Commit Summary --

  * Fix typo

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/permissions/pull/251.patch
https://github.com/w3c/permissions/pull/251.diff

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