[whatwg/fetch] Split `document` destination for top-level and nested contexts. (#819)

Partially addresses whatwg/fetch#755.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/819

-- Commit Summary --

  * Split `document` destination for top-level and nested contexts.

-- File Changes --

    M fetch.bs (9)

-- Patch Links --

https://github.com/whatwg/fetch/pull/819.patch
https://github.com/whatwg/fetch/pull/819.diff

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