[dom] Add hint that `event.bubbles` is configurable. (#35)

Add hint that `event.bubbles` is configurable as initialisation time. The same as its done for `event.cancelable`.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/35

-- Commit Summary --

  * Add hint that `event.bubbles` is configurable.

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/35.patch
https://github.com/whatwg/dom/pull/35.diff

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https://github.com/whatwg/dom/pull/35