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

Example could be something like:

```js
var url = new URL("http://example.org/api"),
     params = { first: "x", second: "y" }
Object.keys(params).forEach((key, value) => { url.searchParams.append(key, value) })
fetch(url).then(/* ... */)
```

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https://github.com/whatwg/fetch/issues/56#issuecomment-111063157