fix AI-191
#### PR Dependency Tree
* **PR #12840** 👈
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## Summary by CodeRabbit
- **New Features**
- Introduced the ability to convert rich text documents into Markdown,
supporting a wide range of content types such as headings, lists,
tables, images, code blocks, attachments, and embedded documents.
- Added support for parsing collaborative document structures and
rendering them as structured Markdown or parsed representations.
- Enhanced handling of database and table blocks, including conversion
to Markdown tables with headers and cell content.
- **Documentation**
- Added a README noting the use of a forked Markdown converter.
- **Tests**
- Added new test coverage for document parsing features.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
#### PR Dependency Tree
* **PR #12840** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
Peng Xiao