Update 4.20.md

Eason51 · Jun 5, 2020 · c5b7b0d · c5b7b0d
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 (e) `++*iter` is not legal. The expression means increasing value of the element, but the value is a `string` and `string` does not have `++` operator.
 
-(f) `iter++->empty()` is legal. The expression means move `iter` to point to the next element and check if that `string` is empty.
+(f) `iter++->empty()` is legal. The expression means move `iter` to point to the next element and check if the original `string` is empty.