[whatwg/fetch] Add `json` to RequestDestination values (#1042)

Looking at the list of values for the spec found here on mdn: https://developer.mozilla.org/en-US/docs/Web/API/RequestDestination#Values

It would be great to have:

```
"json"
The target is json data.
```

Above is mentioning mdn and here is a link to the spec: https://fetch.spec.whatwg.org/#requestdestination


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