fix(BridgeReward): fix specs

src/ronin/gateway/BridgeReward.sol

@@ -56,14 +56,27 @@ contract BridgeReward is IBridgeReward, BridgeTrackingHelper, HasContracts, RONT
 
   /**
    * @dev Helper for running upgrade script, required to only revoked once by the DPoS's governance admin.
-   * The following must be assured after initializing REP2: `{BridgeTracking}._lastSyncPeriod` == `{BridgeReward}.latestRewardedPeriod` == `currentPeriod()`
+   * The following must be assured after initializing REP2:
+   * ```
+   *     {BridgeTracking}._lastSyncPeriod
+   *     == {BridgeReward}.latestRewardedPeriod
+   *     == {RoninValidatorSet}.currentPeriod()
+   * ```
    */
   function initializeREP2() external onlyContract(ContractType.GOVERNANCE_ADMIN) {
     require(getLatestRewardedPeriod() == type(uint256).max, "already init rep 2");
     $_LATEST_REWARDED_PERIOD.store(IRoninValidatorSet(getContract(ContractType.VALIDATOR)).currentPeriod() - 1);
     _setContract(ContractType.GOVERNANCE_ADMIN, address(0));
   }
 
+  /**
+   @dev The following must be assured after initializing V2:
+   * ```
+   *     {BridgeTracking}._lastSyncPeriod
+   *     == {RoninValidatorSet}.currentPeriod()
+   *     == {BridgeReward}.latestRewardedPeriod + 1
+   * ```
+   */
   function initializeV2() external reinitializer(2) {
     $_MAX_REWARDING_PERIOD_COUNT.store(5);
     $_LATEST_REWARDED_PERIOD.store(getLatestRewardedPeriod() - 1);