Re: [whatwg/fetch] Accept headers in spec cause confusion (#274)

`document` is covered by the previous clause:
> If request is a navigation request, a user agent should set value to `text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8`.

But otherwise, the list is not exhaustive. This issue is about making sure that this list enables user agents to maintain useful `Accept` header values that match their supported formats, while staying spec compliant.

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