Update docs

docs/modules/api/examples/governance/MyToken.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+import "@openzeppelin/contracts/../token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/../token/ERC20/extensions/ERC20Permit.sol";
+import "@openzeppelin/contracts/../token/ERC20/extensions/ERC20Votes.sol";
+
+contract MyToken is ERC20, ERC20Permit, ERC20Votes {
+    constructor() ERC20("MyToken", "MTK") ERC20Permit("MyToken") {}
+
+    // The functions below are overrides required by Solidity.
+
+    function _afterTokenTransfer(address from, address to, uint256 amount) internal override(ERC20, ERC20Votes) {
+        super._afterTokenTransfer(from, to, amount);
+    }
+
+    function _mint(address to, uint256 amount) internal override(ERC20, ERC20Votes) {
+        super._mint(to, amount);
+    }
+
+    function _burn(address account, uint256 amount) internal override(ERC20, ERC20Votes) {
+        super._burn(account, amount);
+    }
+}