message: Fixes documentation of multi_label_head to render accepted labels as markdown list
diff: @@ -529,6 +529,7 @@ def multi_label_head(n_classes,
  applications, the shape is `[batch_size, n_classes]`.
  Labels can be:
  +
  * A multi-hot tensor of shape `[D0, D1, ... DN, n_classes]`
  * An integer `SparseTensor` of class indices. The `dense_shape` must be
  `[D0, D1, ... DN, ?]` and the values within `[0, n_classes)`.
  