[w3c/manifest] editorial: fix xref to IDL's sequence (#736)

This change (choose one):

* [x] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)

The following tasks have been completed:

* [x] Confirmed there are no new ReSpec errors/warnings.

Commit message:
Fixed a broken and a missing cross reference 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/736

-- Commit Summary --

  * editorial: fix xref to IDL's sequence

-- File Changes --

    M index.html (5)

-- Patch Links --

https://github.com/w3c/manifest/pull/736.patch
https://github.com/w3c/manifest/pull/736.diff

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