[whatwg/dom] Turn relatedTarget into relatedTargets (#584)

This makes it work for touch events.

Tests: ...

Fixes part of #561.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/584

-- Commit Summary --

  * Turn relatedTarget into relatedTargets

-- File Changes --

    M dom.bs (97)

-- Patch Links --

https://github.com/whatwg/dom/pull/584.patch
https://github.com/whatwg/dom/pull/584.diff

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