Wrong parameter in example code

[ZhekaS]

There should be buffer instead of alarm here:

book/src/development/sensor.md

Lines 149 to 158 in fb92843

	impl Ls1234<'a> {
	pub fn new(i2c: &'a dyn I2CDevice, buffer: &'static mut [u8]) -> Ls1234<'a> {
	Ls1234 {
	i2c: i2c,
	alarm: alarm,
	state: Cell::new(State::Disabled),
	client: OptionalCell::empty(),
	}
	}
	}

[lschuermann]

Makes sense, could you create a PR to fix this? 😄