[w3c/manifest] editorial: use auto pluralize (#683)

Enable the automatic [`pluralize`](https://github.com/w3c/respec/wiki/pluralize) feature
Remove redundant `data-lt` attributes
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/683

-- Commit Summary --

  * Enable automatic pluralization
  * Ran tidy

-- File Changes --

    M index.html (37)

-- Patch Links --

https://github.com/w3c/manifest/pull/683.patch
https://github.com/w3c/manifest/pull/683.diff

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