Documentation mistake related to <th>

Created by: BenMorel

The doc says:

<th> Special table cell for column (or row, depending on scope and placement) labels Must be used within a <thead>

This last line isn't true. This is valid as well:

<table>
        <tbody>
            <tr>
                <th>Caption</th>
                <td>Value 1</td>
                <td>Value 2</td>
            </tr>
        </tbody>
</table>

The doc should be fixed accordingly!