[w3c/manifest] (editorial) Fix a broken local reference (#682)

Also enabled [`local-refs-exist` lint rule](https://github.com/w3c/respec/wiki/local-refs-exist) to prevent broken references in future
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/682

-- Commit Summary --

  * Fix a broken local reference

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/manifest/pull/682.patch
https://github.com/w3c/manifest/pull/682.diff

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