The example of function `set_bits_from_byte` has a write out-of-bounds error.

[rikkaii]

Hi, I've noticed that the following code example causes a write out-of-bounds error. The ffi::modbus_set_bits_from_byte function always writes 8 bytes, and a write out-of-bounds error occurs when the length of dest is less than index + 8.

libmodbus-rs/src/modbus.rs

Lines 831 to 849 in 979e99c

	/// # Examples
	///
	/// ```rust
	/// use libmodbus::{Modbus, ModbusMapping, ModbusTCP};
	/// use libmodbus::prelude::*;
	/// let modbus = Modbus::new_tcp("127.0.0.1", 1502).unwrap();
	/// let modbus_mapping = ModbusMapping::new(5, 5, 5, 5).unwrap();
	///
	/// // before
	/// assert_eq!(modbus_mapping.get_input_bits_mut(), [0u8, 0, 0, 0, 0]);
	///
	/// set_bits_from_byte(modbus_mapping.get_input_bits_mut(), 2, 0b1111_1111);
	///
	/// // after
	/// assert_eq!(modbus_mapping.get_input_bits_mut(), [0u8, 0, 1, 1, 1]);
	/// ```
	pub fn set_bits_from_byte(dest: &mut [u8], index: u32, value: u8) {
	unsafe { ffi::modbus_set_bits_from_byte(dest.as_mut_ptr(), index as c_int, value) }
	}