Update move_semantics2.rs

exercises/move_semantics/move_semantics2.rs

@@ -1,5 +1,4 @@
 // move_semantics2.rs
-// Make me compile without changing line 17 or moving line 14!
 // Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand for a hint.
 
 // Expected output:
@@ -11,6 +10,7 @@
 fn main() {
     let vec0 = Vec::new();
 
+    // Do not move the following line!
     let mut vec1 = fill_vec(vec0);
 
     // Do not change the following line!