[whatwg/url] Be clearer that URL serialization returns an ASCII string. (#428)

I added this fact in the wrong place in #409: it ought to be on the definition of the [URL serializer](https://url.spec.whatwg.org/#concept-url-serializer) and not just [one of the uses](https://url.spec.whatwg.org/#ref-for-concept-url-serializerâ‘ ). (I care because I just wasted a bit of time double-checking that it was true.)

I don't feel strongly about the `Assert` at the bottom of the algorithm.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/428


-- Commit Summary --

  * Be clearer that URL serialization returns an ASCII string.

-- File Changes --

    M url.bs (4)

-- Patch Links --

https://github.com/whatwg/url/pull/428.patch

https://github.com/whatwg/url/pull/428.diff


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