Editorial: fix typo

[TimvdLippe]

• At least two implementers are interested (and none opposed):
  • …
  • …
• Tests are written and can be reviewed and commented upon at:
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• Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
  • Deno (not for CORS changes): …
• MDN issue is filed: …
• The top of this comment includes a clear commit message to use.

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[annevk]

Thanks!