docs: Update import in wikipedia tool documentation (#21565)

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Updates docs so the example doesn't lead to a warning:
```
LangChainDeprecationWarning: Importing tools from langchain is deprecated. Importing from langchain will no longer be supported as of langchain==0.2.0. Please import from langchain-community instead:

`from langchain_community.tools import WikipediaQueryRun`.

To install langchain-community run `pip install -U langchain-community`.
```

pull/21591/head^2

Brian Thorne 4 months ago committed by GitHub

parent 3b0437c05b

commit 25ba733218

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