message: Fixes: GitHub Issue
diff: @@ -529,7 +529,7 @@ def make_vjp(f, params=None, persistent=True):
  wrapped_fn = tfe.make_vjp(f)
  result, vjp = wrapped_fn(tf.constant(3.0))
  # result is 9.0
  - vjp() # the vjp function rturns 6.0
  + vjp() # the vjp function returns 6.0
  Raises:
  ValueError: if `f` returns None.
  