fix: confusing comment in conversions/try_from_into.rs

Co-authored-by: Lebedev <sergey.lebedev@corp.mail.ru>

exercises/conversions/try_from_into.rs

@@ -45,7 +45,7 @@ mod tests {
     use super::*;
     #[test]
     fn test_bad_convert() {
-        // Test that John is returned when bad string is provided
+        // Test that error is returned when bad string is provided
         let p = Person::try_from("");
         assert!(p.is_err());
     }