Re: [whatwg/fetch] Unclear intent in steps 29, 34.3, and 36 of the Request constructor (#358)

I agree it's confusing, but it's important as mutating `Headers` comes with restrictions that might cause exceptions to be thrown, whereas mutating the underlying header list is a free-for-all.

Step 26 could probably use some clarification. I think at the moment the surrounding text assumes the Headers object is associated with r's request's header list, but that's not explicitly stated.

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