[docs] The table in the document is misaligned

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar.

### Fluss version

main (development)

### Please describe the bug 🐞

### Solution

_No response_

### Are you willing to submit a PR?

- [x] I'm willing to submit a PR!

Start by identifying the document and table shown in the attached image; the issue provides no file path, document format, or test entry point. Compare the rendered table with its intended column alignment, then verify the corrected document rendering.

Written by the indexing model from the issue text.