Update docs

docs/modules/api/examples/access-control/AccessControlERC20MintMissing.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
+import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract AccessControlERC20MintMissing is ERC20, AccessControl {
+    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
+    bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");
+
+    constructor() ERC20("MyToken", "TKN") {
+        // Grant the contract deployer the default admin role: it will be able
+        // to grant and revoke any roles
+        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
+    }
+
+    function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {
+        _mint(to, amount);
+    }
+
+    function burn(address from, uint256 amount) public onlyRole(BURNER_ROLE) {
+        _burn(from, amount);
+    }
+}