message: Link to OFF format
diff: @@ -26,7 +26,7 @@ cdef extern from "Off_reader_interface.h" namespace "Gudhi":
  vector[vector[double]] read_points_from_OFF_file(string off_file)
  def read_points_from_off_file(off_file=''):
  - """Read points from OFF file.
  + """Read points from an `OFF file <fileformats.html#off-file-format>`_.
  :param off_file: An OFF file style name.
  :type off_file: string
  @@ -43,7 +43,7 @@ def read_points_from_off_file(off_file=''):
  @cython.embedsignature(True)
  def write_points_to_off_file(fname, points):
  - """Write points to an OFF file.
  + """Write points to an `OFF file <fileformats.html#off-file-format>`_.
  A simple wrapper for `numpy.savetxt`.
  