[whatwg/dom] Editorial: Restore necessary comma (#954)

A comma got dropped in https://github.com/whatwg/dom/commit/83037a1 but the sentence it’s in isn’t grammatical without it, so this change restores it.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/954


-- Commit Summary --

  * Editorial: Restore necessary comma

-- File Changes --

    M dom.bs (2)

-- Patch Links --

https://github.com/whatwg/dom/pull/954.patch

https://github.com/whatwg/dom/pull/954.diff


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