fix(traits5.rs): wrong line number

exercises/traits/traits5.rs

@@ -1,7 +1,7 @@
 // traits5.rs
 //
 // Your task is to replace the '??' sections so the code compiles.
-// Don't change any line other than 27.
+// Don't change any line other than the marked one.
 // Execute `rustlings hint traits5` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE
@@ -25,6 +25,7 @@ struct SomeStruct {
 impl SomeTrait for SomeStruct {}
 impl OtherTrait for SomeStruct {}
 
+// YOU MAY ONLY CHANGE THE NEXT LINE
 fn some_func(item: ??) -> bool {
     item.some_function() && item.other_function()
 }