message: Fix syntax errors in async_scope and async_wait documentation.
diff: @@ -2310,7 +2310,7 @@ def async_scope():
  train_step_fn()
  except tf.errors.OutOfRangeError:
  tf.experimental.async_clear_error()
  - logging.info('loss =', loss.numpy())
  + logging.info('loss = %s', loss.numpy())
  ```
  Yields:
  @@ -2364,7 +2364,7 @@ def async_clear_error():
  except tf.errors.OutOfRangeError:
  tf.experimental.async_clear_error()
  break
  - logging.info('loss =', loss.numpy())
  + logging.info('loss = %s', loss.numpy())
  ```
  """
  context().clear_executor_errors()
  