fix: change tokenURL to tokenURI, according to EIP-721 #2946
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In EIP-721, the ERC-721 Non-Fungible Token Standard, optional metadata extension. Defined a function called "tokenURI"
function tokenURI(uint256 _tokenId) external view returns (string);
https://eips.ethereum.org/EIPS/eip-721
What I did
I changed "tokenURL" to "tokenURI"