message: Fix documentation issue with `tf.nn.conv1d`
  The `tf.nn.conv1d` supports float16, float32, and float64
  though in `tf.nn.conv1d.__doc__` only float16 and float32
  are mentioned. This fix updates the doc string to add
  float64 as the supported data type.
diff: @@ -2454,7 +2454,7 @@ def conv1d(value,
  returned to the caller.
  Args:
  - value: A 3D `Tensor`. Must be of type `float16` or `float32`.
  + value: A 3D `Tensor`. Must be of type `float16`, `float32`, or `float64`.
  filters: A 3D `Tensor`. Must have the same type as `value`.
  stride: An `integer`. The number of entries by which
  the filter is moved right at each step.
  