Update docs

docs/modules/api/examples/token/ERC721/GameItem.sol

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+// contracts/GameItem.sol
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {ERC721URIStorage, ERC721} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
+
+contract GameItem is ERC721URIStorage {
+    uint256 private _nextTokenId;
+
+    constructor() ERC721("GameItem", "ITM") {}
+
+    function awardItem(address player, string memory tokenURI) public returns (uint256) {
+        uint256 tokenId = _nextTokenId++;
+        _mint(player, tokenId);
+        _setTokenURI(tokenId, tokenURI);
+
+        return tokenId;
+    }
+}