[whatwg/dom] Editorial: reference "set an existing attribute value" (#638)

Fixes #637.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/638

-- Commit Summary --

  * Editorial: reference "set an existing attribute value"

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/638.patch
https://github.com/whatwg/dom/pull/638.diff

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