[w3c/manifest] Pick up export in https://github.com/whatwg/html/pull/5717 (#918)

Closes #884 

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [x] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

First pass removing newly-exported references.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/918

-- Commit Summary --

  * Pick up export in https://github.com/whatwg/html/pull/5717

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/manifest/pull/918.patch
https://github.com/w3c/manifest/pull/918.diff

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