message: add doctest p1
diff: @@ -322,18 +322,14 @@ def setdiff1d(x, y, index_dtype=dtypes.int32, name=None):
  out[i] = x[idx[i]] for i in [0, 1, ..., len(out) - 1]
  ```
  - For example, given this input:
  - ```python
  - x = [1, 2, 3, 4, 5, 6]
  - y = [1, 3, 5]
  - ```
  -
  - This operation would return:
  -
  - ```python
  - out ==> [2, 4, 6]
  - idx ==> [1, 3, 5]
  - ```
  + #### EXAMPLE:
  +
  + >>> x = [1, 2, 3, 4, 5, 6]
  + >>> y = [1, 3, 5]
  + >>> result = tf.setdiff1d(x,y)
  + >>> sess = tf.compat.v1.Session()
  + >>> print(sess.run(result))
  + ListDiff(out=array([2, 4, 6], dtype=int32), idx=array([1, 3, 5], dtype=int32))
  Args:
  x: A Tensor. 1-D. Values to keep.
  