Add note about 100% royalty in IERC2981

[ernestognw]

Fixes L-01

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[Amxx]

Suggested change

	* NOTE: Consider 100% royalty is a valid scenario, therefore contracts performing a royalty transfer with the value
	* returned by this function may want to check for 0 value transfers.
	* NOTE: ERC-2981 authorizes setting the royalty to 100% of the price. In that scenario all the price would go
	* toward the royalty receiver, and no tokens would go the the seller. Contracts dealing with royalty should
	* consider that the transfer of value toward the seller might be empty.

[ernestognw]

I'm keeping it, but changing it to two lines, lmk if it doesn't work

suggestion

Suggested change

	* NOTE: Consider 100% royalty is a valid scenario, therefore contracts performing a royalty transfer with the value
	* returned by this function may want to check for 0 value transfers.
	* NOTE: ERC-2981 allows setting the royalty to 100% of the price. In that case, all the price would be sent to the
	* royalty receiver and 0 tokens to the seller. Contracts dealing with royalty should consider empty transfers.