Re: [uievents] Add a note to document of default action of KeyboardEvent for allowing UA not to fire key events for some shortcut keys (#65)

And currently, UI Events spec defines:

"keydown" event as: "A user agent MUST dispatch this event when a key is pressed down."
"keyup" event as: "A user agent MUST dispatch this event when a key is released."

So, "MUST" should be modified with "MAY" or use "except ..." for allowing UA not to dispatch keyboard events if the key combination is registered by UI.

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