[whatwg/fetch] are Headers iterators documented anywhere? (Issue #1437)

Looking at the spec, I can't find any mention of iterators for headers.

Missing:
- `Headers.forEach` (even MDN doesn't document it)
- `Headers.values`
- `Headers.entries`
- `Headers.keys`

If they aren't documented, it would be nice if "Headers Iterator" was defined, since it is not very clear. For example, it behaves like a generator, but doesn't have `.throw()` or `.return()` methods. Plus Firefox (&Deno) calls them "Headers Iterator" while Chrome calls it "Iterator" (checked using `new Headers().keys()[Symbol.toStringTag]`). Thanks 😄

Looking at https://github.com/denoland/deno/issues/981, it looks like they also implemented these methods using trial and error.

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