util.rs: Correct a typo

Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/706>

src/util.rs

@@ -311,7 +311,7 @@ pub trait WarningHandler {
     fn handle(&mut self, warning: &str);
 }
 
-/// Removes the first matcing item
+/// Removes the first matching item
 pub fn vec_remove<T, F: FnMut(&T) -> bool>(v: &mut Vec<T>, pred: F) -> Option<T> {
     let idx = v.iter().position(pred);
     idx.map(|idx| v.remove(idx))