chore: update move_semantics4.rs' hint

after #144, the signature doesn't need changing anymore

Author: alexwh

info.toml

@@ -325,8 +325,7 @@ doing one step and then fixing the compiler errors that result!
 So the end goal is to:
    - get rid of the first line in main that creates the new vector
    - so then `vec0` doesn't exist, so we can't pass it to `fill_vec`
-   - we don't want to pass anything to `fill_vec`, so its signature should
-     reflect that it does not take any arguments
+   - `fill_vec` has had its signature changed, which our call should reflect
    - since we're not creating a new vec in `main` anymore, we need to create
      a new vec in `fill_vec`, similarly to the way we did in `main`"""