[w3c/manifest] chore: fix index section issue (#869)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/869.html" title="Last updated on May 18, 2020, 8:24 AM UTC (98b5b11)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/869/8c7fd7b...98b5b11.html" title="Last updated on May 18, 2020, 8:24 AM UTC (98b5b11)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/869

-- Commit Summary --

  * chore: fix index section issue

-- File Changes --

    M index.html (5)

-- Patch Links --

https://github.com/w3c/manifest/pull/869.patch
https://github.com/w3c/manifest/pull/869.diff

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