Typo in ERC20.sol (#1873)

Changed word from Destoys to Destroys in line number 220.
https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol#L220

Need review. Thanks 👍

contracts/token/ERC20/ERC20.sol

@@ -217,7 +217,7 @@ contract ERC20 is IERC20 {
     }
 
     /**
-     * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
+     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
      * from the caller's allowance.
      *
      * See {_burn} and {_approve}.