Update LangChainLLMs with LLM

[shiyu22]

No description provided.

[SimFG]

The examples using the LangChainLLMs class should also need to be modified accordingly.

# before
langchain_openai = OpenAI(model_name='text-ada-001')
llm = LangChainLLMs(langchain_openai)

# now
langchain_openai = OpenAI(model_name='text-ada-001')
llm = LangChainLLMs(llm=langchain_openai)

please check it

[shiyu22]

The examples using the LangChainLLMs class should also need to be modified accordingly.

# before
langchain_openai = OpenAI(model_name='text-ada-001')
llm = LangChainLLMs(langchain_openai)

# now
langchain_openai = OpenAI(model_name='text-ada-001')
llm = LangChainLLMs(llm=langchain_openai)

please check it

Done

[SimFG]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: shiyu22, SimFG

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