Fix boot-pack help.

[jsirois]

The reference to --path was in error, it should have been
-sj|--jump|--scie-jump.

[jsirois]

The option processing for boot-pack is here:

jump/src/boot/pack.rs

Lines 259 to 283 in 1bd89d3

	pub(crate) fn set(mut jump: Jump, mut scie_jump_path: PathBuf) -> ExitResult {
	let mut lifts = vec![];
	let mut single_line = true;
	let mut args = env::args().skip(1);
	while let Some(arg) = args.next() {
	match arg.as_str() {
	"-1" | "--single-lift-line" => single_line = true,
	"--no-single-lift-line" => single_line = false,
	"-sj" | "--jump" | "--scie-jump" => {
	scie_jump_path = PathBuf::from(args.next().ok_or_else(|| {
	Code::FAILURE.with_message(format!(
	"The {arg} flag requires an argument pointing to an alternate \
	scie-jump binary to pack in the scie tip."
	))
	})?);
	jump.size = scie_jump_path
	.metadata()
	.map_err(|e| {
	Code::FAILURE.with_message(format!(
	"Failed to determine size of alternate scie-jump {path}: {e}",
	path = scie_jump_path.display()
	))
	})?
	.len() as usize;
	}