fix: remove duplicated usage note (mdn#32760)

Pjrich1313 · Mar 20, 2024 · a000324 · a000324
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diff --git a/files/en-us/web/html/element/tr/index.md b/files/en-us/web/html/element/tr/index.md
@@ -340,7 +340,6 @@ th {
 
 {{EmbedLiveSample('Sorting_rows_with_a_click_on_header_cells', '650', '100')}}
 
-> **Note:** To be usable and accessible, the header cell of each sortable column must be identifiable as a sorting button and each must define whether the column is currently sorted in ascending or descending order visually and with the [`aria-sort`](/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-sort) attribute. See the [ARIA Authoring Practices Guide](https://www.w3.org/WAI/ARIA/apg/)'s [sortable table example](https://www.w3.org/WAI/ARIA/apg/patterns/table/examples/sortable-table/) for more information.
 > **Note:** To be usable and accessible, the header cell of each sortable column must be identifiable as a sorting button and each must define whether the column is currently sorted in ascending or descending order visually and with the [`aria-sort`](/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-sort) attribute. See the [ARIA Authoring Practices Guide](https://www.w3.org/WAI/ARIA/apg/)'s [sortable table example](https://www.w3.org/WAI/ARIA/apg/patterns/table/examples/sortable-table/) for more information.
 
 ## Technical summary