message: Clarify doc.
diff: @@ -290,6 +290,8 @@ cdef class SimplexTree:
  def insert_batch(self, some_int[:,:] vertex_array, some_float[:] filtrations):
  """Inserts k-simplices given by a sparse array in a format similar
  to `torch.sparse <https://pytorch.org/docs/stable/sparse.html>`_.
  + The n-th simplex has vertices `vertex_array[0,n]`, ...,
  + `vertex_array[k,n]` and filtration value `filtrations[n]`.
  If a simplex is repeated, the smallest filtration value is used.
  Simplices with a repeated vertex are currently interpreted as lower
  dimensional simplices, but we do not guarantee this behavior in the
  