message: doc review: confusion between i.e. and e.g.
diff: @@ -197,7 +197,7 @@ class Skeleton_blocker_sub_complex : public ComplexType {
  /**
  * @remark waste of time to create a new simplex each time when we could use instead of addresses_sigma_in_link a
  - * simplex with special values (ComplexDS::null_vertex i.e.) to indicate that a vertex does not belong to the complex.
  + * simplex with special values (ComplexDS::null_vertex e.g.) to indicate that a vertex does not belong to the complex.
  */
  template<typename ComplexType>
  bool proper_face_in_union(
  