message: [pdsl_core] Add usage note to Vec::iter docs
diff: @@ -137,6 +137,12 @@ where
  }
  /// Returns an iterator over the references of all elements stored in the vector.
  + ///
  + /// # Note
  + ///
  + /// Note it is **not** recommended to iterate over all elements of a storage vector.
  + /// Make sure that you really need to do this and if you do try to only iterate over a
  + /// limited subset, using e.g. `Iterator::take(n)`.
  pub fn iter(&self) -> Iter<T> {
  Iter::new(self)
  }
  