doc: make install from source more clearer (#9433)

Description: if just `pip install -e .` it will not install anything, we
have to find the right directory to do `pip install -e .`
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呂安 2023-08-18 22:30:55 +08:00 committed by GitHub
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@ -40,7 +40,7 @@ pip install 'langchain[all]'
## From source
If you want to install from source, you can do so by cloning the repo and running:
If you want to install from source, you can do so by cloning the repo and be sure that the directory is `PATH/TO/REPO/langchain/libs/langchain` running:
```bash
pip install -e .