[whatwg/url] UrlSearchParams.set stringifier clarification (#383)

According to spec UrlSearchParams.set have the following definition:
```
void set(USVString name, USVString value);
```
But we discovered that stringifier is called on value.

What is the recommendation for [typescript typings](https://github.com/Microsoft/TSJS-lib-generator/issues/464) ?

@saschanaz


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