message: docs(data-table): updating `sort-direction` docs
diff: /**
  * @license
  *
  - * Copyright IBM Corp. 2019, 2020
  + * Copyright IBM Corp. 2019, 2021
  *
  * This source code is licensed under the Apache-2.0 license found in the
  * LICENSE file in the root directory of this source tree.
  @@ -95,7 +95,7 @@ class BXTableHeaderCell extends FocusMixin(LitElement) {
  /**
  * The table sort direction.
  - * If present, this table header cell will have a sorting UI.
  + * If present, this table header cell will have a sorting UI. Choose between `ascending` or `descending`.
  */
  @property({ reflect: true, attribute: 'sort-direction' })
  sortDirection?: TABLE_SORT_DIRECTION;
  