Update instructions for bit enumeration

[paiv]

"leftmost bit" is the most significant bit, whereas the exercise is designed for least significant bit.

swift/exercises/concept/bomb-defuser/.meta/Sources/BombDefuser/BombDefuserExemplar.swift

Lines 18 to 25 in 91b329a

	for _ in 1...8 {
	if bits.isMultiple(of: 2) {
	order = flipper(order)
	} else {
	order = rotator(order)
	}
	bits /= 2
	}

• https://en.wikipedia.org/wiki/Bit_numbering

Upd: just have seen this discussed in #496

[kytrinyx]

I'm going to go ahead and close as this is a duplicate. Thank you ❤️