Re: [whatwg/fetch] More informative error types (#526)

I imagine it'd be hard to get data on that. There's no clear API entry point we could add a UseCounter for. We could probably do a search on HTTPArchive to try to find sites that do this. What would the script code look like?  Something like this?
```fetch(...).catch(err => { err instanceof TypeError; })```

cc @yutakahirano 

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