Update docs

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

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+import "@openzeppelin/contracts/../governance/Governor.sol";
+import "@openzeppelin/contracts/../governance/compatibility/GovernorCompatibilityBravo.sol";
+import "@openzeppelin/contracts/../governance/extensions/GovernorVotes.sol";
+import "@openzeppelin/contracts/../governance/extensions/GovernorVotesQuorumFraction.sol";
+import "@openzeppelin/contracts/../governance/extensions/GovernorTimelockControl.sol";
+
+contract MyGovernor is
+    Governor,
+    GovernorCompatibilityBravo,
+    GovernorVotes,
+    GovernorVotesQuorumFraction,
+    GovernorTimelockControl
+{
+    constructor(
+        IVotes _token,
+        TimelockController _timelock
+    ) Governor("MyGovernor") GovernorVotes(_token) GovernorVotesQuorumFraction(4) GovernorTimelockControl(_timelock) {}
+
+    function votingDelay() public pure override returns (uint256) {
+        return 7200; // 1 day
+    }
+
+    function votingPeriod() public pure override returns (uint256) {
+        return 50400; // 1 week
+    }
+
+    function proposalThreshold() public pure override returns (uint256) {
+        return 0;
+    }
+
+    // The functions below are overrides required by Solidity.
+
+    function state(
+        uint256 proposalId
+    ) public view override(Governor, IGovernor, GovernorTimelockControl) returns (ProposalState) {
+        return super.state(proposalId);
+    }
+
+    function propose(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        string memory description
+    ) public override(Governor, GovernorCompatibilityBravo, IGovernor) returns (uint256) {
+        return super.propose(targets, values, calldatas, description);
+    }
+
+    function cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) public override(Governor, GovernorCompatibilityBravo, IGovernor) returns (uint256) {
+        return super.cancel(targets, values, calldatas, descriptionHash);
+    }
+
+    function _execute(
+        uint256 proposalId,
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) internal override(Governor, GovernorTimelockControl) {
+        super._execute(proposalId, targets, values, calldatas, descriptionHash);
+    }
+
+    function _cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) internal override(Governor, GovernorTimelockControl) returns (uint256) {
+        return super._cancel(targets, values, calldatas, descriptionHash);
+    }
+
+    function _executor() internal view override(Governor, GovernorTimelockControl) returns (address) {
+        return super._executor();
+    }
+
+    function supportsInterface(
+        bytes4 interfaceId
+    ) public view override(Governor, IERC165, GovernorTimelockControl) returns (bool) {
+        return super.supportsInterface(interfaceId);
+    }
+}