message: Fix code examples in print_tensor docstring
  Summary: Corrected typos in code examples
  Test Plan: Built whl and doc locally.
  Reviewers: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, hakons
  Subscribers: hakons
  Maniphest Tasks: T21264
diff: @@ -89,6 +89,7 @@ def print_tensor(input, name=""):
  executed ops by specifying with tf.control_dependencies([print_op]).
  Examples:
  +
  1. Returning the print operation as part of the XLA function:
  .. code-block:: python
  @@ -121,7 +122,7 @@ def print_tensor(input, name=""):
  with ops.ipu_scope("/device:IPU:0"):
  pa = tf.placeholder(np.float32, [2, 2], name="a")
  - print_op = internal.print_tensor(pa)
  + print_op = internal_ops.print_tensor(pa)
  x = pa + 1
  with tf.Session() as session:
  @@ -142,7 +143,7 @@ def print_tensor(input, name=""):
  with ops.ipu_scope("/device:IPU:0"):
  pa = tf.placeholder(np.float32, [2, 2], name="a")
  - print_op = internal.print_tensor(pa)
  + print_op = internal_ops.print_tensor(pa)
  with tf.control_dependencies([print_op]):
  x = pa + 1
  