[whatwg/fetch] No documentation of which ports are used by default (#667)

I was trying to find out which ports are used by fetch when none are specified. 

And while browsers seem to use 80 and 443 as might be expected I was surprised not to find this specified anywhere. But why 80/443 when payloads are unlikely to be HTML?

In fact this appears to be true of any request mechanism I looked at.

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