[w3c/uievents] Button order for MouseEvent.button vs MouseEvent.buttons very easy to miss (Issue #390)

For what I assume historical reasons, `MouseEvent.button` and `MouseEvent.buttons` do not order buttons in the same way. The second and third button switch meaning between the two attributes.

This is very easy to overlook, so I think a warning note would be very useful.

(If MDN could also get a warning, then that would be fantastic)

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