fix: dropUntil.ts example

[hg-pyun]

As-Is

// The example answer is 3, 4, 5, but the correct answer is 2, 3, 4, 5, 1, 2 
const iter = dropUntil((a) => a < 3, [1, 2, 3, 4, 5, 1, 2])

To-Be

I think it is a mistake copying and pasting dropWhile. Considering the context, I think it's the right way to change it as follows.

const iter = dropUntil((a) => a > 3, [1, 2, 3, 4, 5, 1, 2]);