Update docs

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);
+    }
+}