[whatwg/xhr] Remove substep usage (#228)

It's bad practice these days per the Infra Standard and somewhat ambiguous at times.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/228

-- Commit Summary --

  * Remove substep usage

-- File Changes --

    M xhr.bs (56)

-- Patch Links --

https://github.com/whatwg/xhr/pull/228.patch
https://github.com/whatwg/xhr/pull/228.diff

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https://github.com/whatwg/xhr/pull/228