[w3c/manifest] fix (index): fix 'covert' typos (#521)

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

  https://github.com/w3c/manifest/pull/521

-- Commit Summary --

  * fix (index): fix 'covert' typos

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/manifest/pull/521.patch
https://github.com/w3c/manifest/pull/521.diff

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