message: Fix doc of the output iterator
diff: @@ -257,7 +257,7 @@ class Kd_tree_search {
  /// @param[in] p The query point.
  /// @param[in] radius The search radius
  /// @param[out] it The points that lie inside the sphere of center `p` and radius `radius`.
  - /// The `value_type` of the iterator must be `Point`.
  + /// Note: `it` is used this way: `*it++ = each_point`.
  /// @param[in] eps Approximation factor.
  template <typename OutputIterator>
  void radius_search(
  