old_contents: """
  Numpy extensions.
  """
  
  from numba.targets.arraymath import cross2d
  
  
  __all__ = [
      'cross2d'
  ]
  
new_contents: """
  NumPy extensions.
  """
  
  from numba.targets.arraymath import cross2d
  
  
  __all__ = [
      'cross2d'
  ]
  
subject: update numpy_extensions module docstring