[whatwg/dom] Note retargeting usage in Fullscreen (#630)

Mostly so I remember it's not just events.

Fixes #620.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/630

-- Commit Summary --

  * Note retargeting usage in Fullscreen

-- File Changes --

    M dom.bs (8)

-- Patch Links --

https://github.com/whatwg/dom/pull/630.patch
https://github.com/whatwg/dom/pull/630.diff

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