Replace em dashes with hyphens across docs and comments

packages/rust-core/src/gcode.rs

@@ -1,7 +1,7 @@
 use crate::error::{Error, Result};
 use std::collections::BTreeMap;
 
-/// XORs every byte together — the standard Marlin/RepRap G-code checksum.
+/// XORs every byte together - the standard Marlin/RepRap G-code checksum.
 /// Covers everything before the `*`, including a leading `N<n> ` line number
 /// if present.
 pub fn compute_checksum(data: &[u8]) -> u8 {
@@ -38,7 +38,7 @@ pub fn append_checksum(line: &str) -> String {
 /// settings this way at the top of the file.
 ///
 /// This only handles that one format. Real slicer output has more variety
-/// (Cura's `;KEY:value` style, free-form "generated by ..." comments) —
+/// (Cura's `;KEY:value` style, free-form "generated by ..." comments) -
 /// add support for those once this simple version makes sense.
 pub fn parse_header(gcode: &str) -> BTreeMap<String, String> {
     let mut fields = BTreeMap::new();