better description of function tee to avoid misunderstandings
@@ -780,7 +780,7 @@ pub trait Itertools : Iterator {
/// the original iterator.
///
/// **Note:** If the iterator is clonable, prefer using that instead
- /// of using this method. It is likely to be more efficient.
+ /// of using this method. Cloning is likely to be more efficient.
///
/// Iterator element type is `Self::Item`.
///
