message: Update comment in the test
  `checked is done in kernel.` -> `checked in kernel.`
  for review feedback.
diff: @@ -107,7 +107,7 @@ class RollTest(test_util.TensorFlowTestCase):
  manip_ops.roll(7, 1, 0)
  def testRollInputMustVectorHigherRaises(self):
  - # The input should be 1-D or higher, checked is done in kernel.
  + # The input should be 1-D or higher, checked in kernel.
  tensor = array_ops.placeholder(dtype=dtypes.int32)
  shift = 1
  axis = 0
  