message: Remove explicit assert
diff: @@ -125,8 +125,8 @@ def string_format(template, inputs, placeholder="{}", summarize=3, name=None):
  ```python
  >>> tensor = tf.range(10)
  >>> formatted = tf.strings.format("tensor: {}, suffix", tensor)
  - >>> expected = "tensor: [0 1 2 ... 7 8 9], suffix"
  - >>> assert(formatted == expected)
  + >>> print(formatted)
  + tf.Tensor(b'tensor: [0 1 2 ... 7 8 9], suffix', shape=(), dtype=string)
  ```
  Formatting a multi-tensor template:
  @@ -135,14 +135,8 @@ def string_format(template, inputs, placeholder="{}", summarize=3, name=None):
  >>> tensor_two = tf.range(10)
  >>> formatted = tf.strings.format("first: {}, second: {}, suffix",
  ... (tensor_one, tensor_two))
  - >>> expected = ("first: [[0 1 2 ... 7 8 9]\n"
  - ... " [10 11 12 ... 17 18 19]\n"
  - ... " [20 21 22 ... 27 28 29]\n"
  - ... " ...\n"
  - ... " [70 71 72 ... 77 78 79]\n"
  - ... " [80 81 82 ... 87 88 89]\n"
  - ... " [90 91 92 ... 97 98 99]], second: [0 1 2 ... 7 8 9], suffix")
  - >>> assert(formatted == expected)
  + >>> print(formatted)
  + tf.Tensor(b'first: [[0 1 2 ... 7 8 9]\n [10 11 12 ... 17 18 19]\n [20 21 22 ... 27 28 29]\n ...\n [70 71 72 ... 77 78 79]\n [80 81 82 ... 87 88 89]\n [90 91 92 ... 97 98 99]], second: [0 1 2 ... 7 8 9], suffix', shape=(), dtype=string)
  ```
  Args:
  