Update docs

docs/modules/api/examples/token/ERC1155/GameItems.sol

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+// contracts/GameItems.sol
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {ERC1155} from "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
+
+contract GameItems is ERC1155 {
+    uint256 public constant GOLD = 0;
+    uint256 public constant SILVER = 1;
+    uint256 public constant THORS_HAMMER = 2;
+    uint256 public constant SWORD = 3;
+    uint256 public constant SHIELD = 4;
+
+    constructor() ERC1155("https://game.example/api/item/{id}.json") {
+        _mint(msg.sender, GOLD, 10 ** 18, "");
+        _mint(msg.sender, SILVER, 10 ** 27, "");
+        _mint(msg.sender, THORS_HAMMER, 1, "");
+        _mint(msg.sender, SWORD, 10 ** 9, "");
+        _mint(msg.sender, SHIELD, 10 ** 9, "");
+    }
+}

docs/modules/api/examples/token/ERC1155/MyERC115HolderContract.sol

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+// contracts/MyERC115HolderContract.sol
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {ERC1155Holder} from "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
+
+contract MyERC115HolderContract is ERC1155Holder {}

docs/modules/api/examples/token/ERC20/GLDToken.sol

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+// contracts/GLDToken.sol
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract GLDToken is ERC20 {
+    constructor(uint256 initialSupply) ERC20("Gold", "GLD") {
+        _mint(msg.sender, initialSupply);
+    }
+}

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;
+    }
+}