Update Exercises Directory Names to Reflect Order

exercises/06_move_semantics/move_semantics5.rs

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+// move_semantics5.rs
+//
+// Make me compile only by reordering the lines in `main()`, but without adding,
+// changing or removing any of them.
+//
+// Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand
+// for a hint.
+
+// I AM NOT DONE
+
+#[test]
+fn main() {
+    let mut x = 100;
+    let y = &mut x;
+    let z = &mut x;
+    *y += 100;
+    *z += 1000;
+    assert_eq!(x, 1200);
+}