Re: [heycam/webidl] Add an informative section on overloads vs. unions/optional (#307)

Oh, and I agree that there are overload uses that are probably somewhat silly.  Still in CanvasDrawPath, this:

    void stroke();
    void stroke(Path2D path);

can totally be written as `void stroke(optional Path2D path);` as long as you're cool with `stroke(undefined)` not throwing.

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