message: Improve docstring formatting for tf.case.
diff: @@ -3011,22 +3011,27 @@ def case(pred_fn_pairs, default, exclusive=False, strict=False, name="case"):
  deterministic, so that variables created in conditional branches are created
  in fixed order across runs.
  - Example 1:
  + **Example 1:**
  +
  Pseudocode:
  +
  ```
  if (x < y) return 17;
  else return 23;
  ```
  Expressions:
  - ```
  +
  + ```python
  f1 = lambda: tf.constant(17)
  f2 = lambda: tf.constant(23)
  r = case([(tf.less(x, y), f1)], default=f2)
  ```
  - Example 2:
  + **Example 2:**
  +
  Pseudocode:
  +
  ```
  if (x < y && x > z) raise OpError("Only one predicate may evaluate true");
  if (x < y) return 17;
  @@ -3035,7 +3040,8 @@ def case(pred_fn_pairs, default, exclusive=False, strict=False, name="case"):
  ```
  Expressions:
  - ```
  +
  + ```python
  def f1(): return tf.constant(17)
  def f2(): return tf.constant(23)
  def f3(): return tf.constant(-1)
  