[whatwg/fetch] `prefetch` initiator appears to be unused (#1008)

[This part of the fetch spec](https://fetch.spec.whatwg.org/#concept-request-initiator) says that requests have an associated initiator, for which one of the possible values is `prefetch` (added in https://github.com/whatwg/fetch/pull/659, so cc @yoavweiss and @annevk as the most likely people to know abou this). A table shortly below it says that `prefetch` initiator is used for "HTML’s <link rel=prefetch>". But neither the [HTML spec](https://html.spec.whatwg.org/multipage/) nor the [resource hints spec](https://w3c.github.io/resource-hints/) (the only other place I could think where it would be defined) make any mention of this. The resource hints spec doesn't even mention initiators at all.

Is there somewhere else I should be looking?



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