[whatwg/dom] Correct setting of target and relatedTargets post-dispatch (#585)

Note that this very much depends on #584, though if folks want they could be reviewed and maybe even landed together.

cc @whatwg/components 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/585

-- Commit Summary --

  * Turn relatedTarget into relatedTargets
  * Correct setting of target and relatedTargets post-dispatch

-- File Changes --

    M dom.bs (106)

-- Patch Links --

https://github.com/whatwg/dom/pull/585.patch
https://github.com/whatwg/dom/pull/585.diff

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