Update ERC721URIStorage.sol

Author: Amxx

contracts/token/ERC721/extensions/ERC721URIStorage.sol

@@ -49,10 +49,6 @@ abstract contract ERC721URIStorage is IERC4906, ERC721 {
      * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
      *
      * Emits {MetadataUpdate}.
-     *
-     * Requirements:
-     *
-     * - `tokenId` must exist.
      */
     function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
         _tokenURIs[tokenId] = _tokenURI;