docs: Fix TableView empty state example dropping TableBody tag

[patrickwehbe]

Closes #10231

Problem

On https://react-spectrum.adobe.com/TableView#empty-state the rendered example code is missing its <TableBody> opening tag, and "Open in StackBlitz" produces code that does not compile (an orphaned renderEmptyState prop with no element).

Root cause

The example wrapped a single highlighted block with two - begin highlight - markers but only one - end highlight -:

{/*- begin highlight -*/}
<TableBody
  /*- begin highlight -*/   // <- redundant second begin
  renderEmptyState={() => (
    ...
  )}>
  {/*- end highlight -*/}

The docs code highlighter (packages/dev/s2-docs/src/Code.tsx, function lines()) starts a new highlight grouping on every begin marker and resets the current line, with no guard for a grouping that is already open. The second begin therefore replaced the in-progress grouping and discarded the already-accumulated <TableBody line. Because the StackBlitz / copy / download export (getExampleCode in CodePlatter.tsx) reads the same rendered code from the DOM, both the displayed snippet and the exported file lost the tag.

Fix

Remove the redundant inner /*- begin highlight -*/ marker, leaving the canonical single begin/end pair already used elsewhere in this file (e.g. the treeColumn example just above). The full <TableBody ... renderEmptyState> tag now renders and the example compiles in StackBlitz.

Verification

Ran the actual tree-sitter-highlight highlighter through a faithful port of Code.tsx's lines() grouping logic on the on-disk example:

• Before: rendered output jumps from </TableHeader> straight to renderEmptyState={() => ( — <TableBody absent.
• After: <TableBody ... renderEmptyState> present, valid JSX, all highlight markers stripped.

This is a docs-only change in a private package, so no changeset is included (consistent with recent docs-example fixes such as #10214).

[snowystinger]

Thanks for fixing that!