[Issue]: docs/prompt_tuning/manual_prompt_tuning.md 链接更新

[chinario]

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• [ ] I have searched the existing issues and this bug is not already filed.
• [ ] My model is hosted on OpenAI or Azure. If not, please look at the "model providers" issue and don't file a new one here.
• [ ] I believe this is a legitimate bug, not just a question. If this is a question, please use the Discussions area.

Describe the issue

Entity/Relationship Extraction下的Prompt Source链接未更新。该处应该指向graphrag/query/context_builder/entity_extraction.py

Steps to reproduce

No response

GraphRAG Config Used

# Paste your config here

Logs and screenshots

No response

Additional Information

• GraphRAG Version:
• Operating System:
• Python Version:
• Related Issues: