React Fiber documentation not present in the current Docs

The current React documentation does not include detailed information about React Fiber. Given the importance and impact of React Fiber on React's performance and internal mechanisms, it would be beneficial for developers to have comprehensive documentation on this topic.

Proposed Content:

1. Introduction to React Fiber
2. How React Fiber differs from the previous reconciliation algorithm
3. Benefits of React Fiber
4. How React Fiber works (including concepts like work loops, priority levels, and interruption)
5. Examples and use cases demonstrating React Fiber's advantages

Rationale:
Having thorough documentation on React Fiber will help developers understand the underlying architecture of React, enabling them to write more efficient and optimized applications. It will also aid in debugging and enhancing their knowledge of React's performance improvements.

Additional Information:
If there are any existing resources or blog posts that can be referred to in the meantime, it would be helpful to include those as well.

未指定特定的檔案、測試或文件入口。請先檢視目前的 React 文件，以及 issue 中提到的現有資源或部落格文章。完成的標準是全面涵蓋提出的五個領域，包括 Fiber 的架構、reconciliation 的差異、優點、work loops、優先順序、中斷和範例。