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 {}