Does Wing also developed the ability to transmute his aura into electricity?
I'm inclined to say that that's not actual electricity, but just a visual presentation of Wing imbuing the paper with "energy". A visual flare added as extra clarity for the viewers/readers, who are not yet that familiar with Nen and what all it can do. (Except for the 1999 anime. Even in the manga the "electro-likeness" of the effect is arguable, as it could be seen as more general representations of "energy" or "power" or even a "shock wave".)

I could go on about Wings nen-type, the likelyhood he'd learn transmutation powers, spesifics that would go to learning this spesific power, if Wing would be skilled enough to do this and if he even wanted to. But I think there's a more simple way to conclude that it's not actual electricity.

Apart from the visuals, it doesn't actually act like electricity in any way, shape or form.
The paper hardenes, cuts clean through a can and embeds itself to a wall. Nothing in the way it or the objects around it act indicates a presence of electricity. (They don't exactly dismiss it either, but then again, what would be the point of electricity, if it has no use.)