fix: add comment, remove unused imports

test/LightRelay.t.sol

@@ -1,13 +1,14 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity 0.8.17;
 
-import {Test, console2} from "forge-std/Test.sol";
+import {Test} from "forge-std/Test.sol";
 
 import {LightRelay} from "../src/relay/LightRelay.sol";
 import {ILightRelay} from "../src/relay/LightRelay.sol";
 import {BitcoinTx} from "../src/bridge/BitcoinTx.sol";
 import {BridgeState} from "../src/bridge/BridgeState.sol";
-import "forge-std/console.sol";
+
+// Light relay test cases imported from: https://github.com/keep-network/tbtc-v2/blob/cadead9ecd6005325ace4d64288c20733b058352/solidity/test/relay/LightRelay.test.ts
 
 contract LightRelayTest is Test {
     using BitcoinTx for BridgeState.Storage;