message: Add comment in code for get_boundaries if not interested in filtration values
diff: @@ -287,6 +287,8 @@ cdef class SimplexTree:
  def get_boundaries(self, simplex):
  """This function returns a generator with the boundaries of a given N-simplex.
  + If you do not need the filtration values, the boundary can also be obtained as
  + :code:`itertools.combinations(simplex,len(simplex)-1)`.
  :param simplex: The N-simplex, represented by a list of vertex.
  :type simplex: list of int.
  