Re: [whatwg/fetch] Document usage for GET requests with URI parameters (#56)

@annevk, I agree on the part of `searchParams` in Firefox, but this part is wrong:
```js
Object.keys(params).forEach((key, value) => { url.searchParams.append(key, value) })
```
This part will always put the index as a value: `"https://example.org/api?first=0&second=1"`
I just wanted to leave a working example since this page is one of the first results thrown by google

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