[whatwg/xhr] Spell out implicit serialization (#223)

I think this is what should be done. As an implementor, it is important to have everything spelled out. But I could be wrong here as well, so this is my way of asking? :)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/223

-- Commit Summary --

  * Spell out implicit serialization

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/223.patch
https://github.com/whatwg/xhr/pull/223.diff

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