message: fix doc formatting for tf.print
diff: @@ -158,23 +158,28 @@ def print_v2(*inputs, **kwargs):
  Example:
  Single-input usage:
  +
  ```python
  tf.compat.v1.enable_eager_execution()
  tensor = tf.range(10)
  tf.print(tensor, output_stream=sys.stderr)
  ```
  +
  (This prints "[0 1 2 ... 7 8 9]" to sys.stderr)
  Multi-input usage:
  +
  ```python
  tf.compat.v1.enable_eager_execution()
  tensor = tf.range(10)
  tf.print("tensors:", tensor, {2: tensor * 2}, output_stream=sys.stdout)
  ```
  +
  (This prints "tensors: [0 1 2 ... 7 8 9] {2: [0 2 4 ... 14 16 18]}" to
  sys.stdout)
  Usage in a defun:
  +
  ```python
  tf.compat.v1.enable_eager_execution()
  @@ -186,9 +191,11 @@ def print_v2(*inputs, **kwargs):
  range_tensor = f()
  ```
  +
  (This prints "[0 1 2 ... 7 8 9]" to sys.stderr)
  Usage when constructing graphs:
  +
  ```python
  sess = tf.compat.v1.Session()
  with sess.as_default():
  @@ -199,6 +206,7 @@ def print_v2(*inputs, **kwargs):
  tripled_tensor = tensor * 3
  sess.run(tripled_tensor)
  ```
  +
  (This prints "tensors: [0 1 2 ... 7 8 9] {2: [0 2 4 ... 14 16 18]}" to
  sys.stdout)
  