[whatwg/dom] Editorial: move contains check into "remove an event listener" (#820)

Fixes #788.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/820

-- Commit Summary --

  * Add a comma before "given" in "add an event listener" definition
  * Update my name in acknowledgments section
  * Move contains check into "remove an event listener"

-- File Changes --

    M dom.bs (22)

-- Patch Links --

https://github.com/whatwg/dom/pull/820.patch
https://github.com/whatwg/dom/pull/820.diff

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