Update docs

contracts/mocks/GovernorCompMock.sol

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "../governance/extensions/GovernorCountingSimple.sol";
+import "../governance/extensions/GovernorVotesComp.sol";
+
+contract GovernorCompMock is GovernorVotesComp, GovernorCountingSimple {
+    constructor(string memory name_, ERC20VotesComp token_) Governor(name_) GovernorVotesComp(token_) {}
+
+    function quorum(uint256) public pure override returns (uint256) {
+        return 0;
+    }
+
+    function votingDelay() public pure override returns (uint256) {
+        return 4;
+    }
+
+    function votingPeriod() public pure override returns (uint256) {
+        return 16;
+    }
+
+    function cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 salt
+    ) public returns (uint256 proposalId) {
+        return _cancel(targets, values, calldatas, salt);
+    }
+
+    function getVotes(address account, uint256 blockNumber)
+        public
+        view
+        virtual
+        override(IGovernor, GovernorVotesComp)
+        returns (uint256)
+    {
+        return super.getVotes(account, blockNumber);
+    }
+}