Fix HTML table error

Author: forestream

apps/landing/src/app/(detail)/components/button/Api.mdx

@@ -5,12 +5,15 @@ import { Td, Th, Tr, Table } from '../Table'
 `Button` props extends the button HTML attributes. 
 <div style={{ overflow: 'auto', width: '100%' }}>
 <Table style={{width: '100%'}}>
+<thead>
 <Tr>
 <Th>Property</Th>
 <Th>Description</Th>
 <Th>Type</Th>
 <Th>Default</Th>
 </Tr>
+</thead>
+<tbody>
 <Tr>
 <Td>variant</Td>
 <Td>The variant of the button</Td>
@@ -61,5 +64,6 @@ button should have a width to be able to truncate the text.
 <Td>`boolean`</Td>
 <Td>`false`</Td>
 </Tr>
+</tbody>
 </Table>
 </div>