Fix comments (#519)

Author: adamdossa

contracts/tokens/SecurityToken.sol

@@ -499,14 +499,14 @@ contract SecurityToken is StandardToken, DetailedERC20, ReentrancyGuard, Registr
     }
 
     /**
-     * @notice Internal - adjusts totalSupply at checkpoint after minting or burning tokens
+     * @notice Internal - adjusts totalSupply at checkpoint before minting or burning tokens
      */
     function _adjustTotalSupplyCheckpoints() internal {
         TokenLib.adjustCheckpoints(checkpointTotalSupply, totalSupply(), currentCheckpointId);
     }
 
     /**
-     * @notice Internal - adjusts token holder balance at checkpoint after a token transfer
+     * @notice Internal - adjusts token holder balance at checkpoint before a token transfer
      * @param _investor address of the token holder affected
      */
     function _adjustBalanceCheckpoints(address _investor) internal {