docs(own-and-return): split long comment in two lines

subjects/own-and-return/README.md

@@ -40,10 +40,12 @@ pub struct Film {
 fn main() {
     let my_film = Film { name: "Terminator".toString() };
     println!("{}", take_film_name(/* to be implemented */));
-    // the order of the print statements is intentional, if your implementation is correct, you should have a compile error because my_film was consumed
+    // the order of the print statements is intentional, if your implementation is correct,
+    // you should have a compile error because my_film was consumed
     println!("{}", read_film_name(/* to be implemented */));
     println!("{}", take_film_name(/*to be implemented*/))
-    // you can test this function by commenting out the first print statement, you should see the expected output without errors in this case
+    // you can test this function by commenting out the first print statement,
+    // you should see the expected output without errors in this case
 }
 ```