[whatwg/dom] Export attribute change steps (#567)

So that other spec can actually use it.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/567

-- Commit Summary --

  * Export attribute change steps.

-- File Changes --

    M dom.bs (2)

-- Patch Links --

https://github.com/whatwg/dom/pull/567.patch
https://github.com/whatwg/dom/pull/567.diff

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