[whatwg/fetch] Unclear how to serialize request origin "client" (Issue #1773)

### What is the issue with the Fetch Standard?

When [`serializing a request origin`](https://fetch.spec.whatwg.org/#serializing-a-request-origin), Step 2. tells us to
`Return request's origin, serialized`. A [request's origin](https://fetch.spec.whatwg.org/#concept-request-origin) is either `"client"` or an [Origin](https://html.spec.whatwg.org/multipage/browsers.html#concept-origin). However, the 

 [`ASCII serialisation of an origin`](https://html.spec.whatwg.org/multipage/browsers.html#ascii-serialisation-of-an-origin) algorithm referenced in Step 2. does not handle the case of a `"client"` origin. (Because it is about serializing an origin as described in the HTML spec, not a request's origin as described in the fetch spec.)

How should an origin of `"client"` be serialized?

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