Fix typo in retrieval of onERC721Received selector (#3151)

contracts/token/ERC721/IERC721Receiver.sol

@@ -16,7 +16,7 @@ interface IERC721Receiver {
      * It must return its Solidity selector to confirm the token transfer.
      * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
      *
-     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
+     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
      */
     function onERC721Received(
         address operator,