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langchain/langchain/chains
warjiang 511c12dd39 fix: update qa_chain doc for "chai_type" (#5877)
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`load_qa_with_sources_chain` method already support four type of chain,
including `map_rerank`. update document to prevent any misunderstandings
😀.

![image](https://github.com/hwchase17/langchain/assets/6478745/325260b2-6121-4900-aef9-001febff811a)

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Fixes # (issue)
No, just update document.

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