Clarify order of elements

Co-authored-by: Mo Bitar <76752051+mo8it@users.noreply.github.com>

Author: senekor

exercises/05_vecs/vecs1.rs

@@ -1,5 +1,5 @@
 fn elems_to_vec(a: i32, b: i32, c: i32) -> Vec<i32> {
-    // TODO: Return a vector containing the elements a, b and c.
+    // TODO: Return a vector containing the elements a, b and c (in this order).
     // Use the "vec!" macro.
 }