Add R3L to readme and doc

[yanxi-chen]

Description

As the title says.

Checklist

Please check the following items before code is ready to be reviewed.

• Code has passed all tests
• Docstrings have been added/updated in Google Style
• Documentation has been updated
• Code is ready for review

[gemini-code-assist]

Summary of Changes

Hello @yanxi-chen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the project's documentation to formally introduce R3L, a new reflect-then-retry Reinforcement Learning mechanism. The changes ensure that both English and Chinese-speaking users are informed about this development, providing clear links to its repository and associated research paper within the main README files and the Sphinx documentation. This enhances the discoverability and accessibility of the R3L project within the Trinity-RFT ecosystem.

Highlights

• R3L Integration in READMEs: Added a news entry for R3L (reflect-then-retry RL) to both the English and Chinese README.md files, providing links to its GitHub repository and research paper.
• R3L in Documentation: Integrated R3L into the 'Algorithm development' section across both English and Chinese README.md and Sphinx documentation files (docs/sphinx_doc/source/main.md, docs/sphinx_doc/source_zh/main.md), ensuring its visibility and accessibility.

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[gemini-code-assist]

Code Review

This pull request adds information about R3L to the README files (both English and Chinese versions) and the corresponding Sphinx documentation. The changes include adding a news item and an entry in the algorithm development table. The updates are clear and consistent across the files. I've suggested a minor punctuation fix for consistency in the Chinese README.