[w3c/manifest] Misc chores (#671)

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

  https://github.com/w3c/manifest/pull/671

-- Commit Summary --

  * chore: Remove spurious trailing comma.
  * chore: Consistent casing of reference (fix respec warning).

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/manifest/pull/671.patch
https://github.com/w3c/manifest/pull/671.diff

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