fixed errors in commit which would lead to false library usage:

rosidl_runtime_rs/src/sequence.rs

@@ -476,10 +476,9 @@ where
 /// ```
 /// use rosidl_runtime_rs::Sequence;
 ///
-/// let original = Sequence::new(vec![1, 2, 3]);
+/// let original = Sequence::new(6);
 /// let cloned = original.clone();
 ///
-/// assert_eq!(original.data, cloned.data);
 /// ```
 ///
 /// # Panics