docs:Add SWI-Prolog for langchain-prolog (#30081)

Some users have complained that t is not clear that SWI-Prolog must be
installed before installing langchain-prolog.
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Antonio Pisani 2025-03-04 08:12:47 -06:00 committed by GitHub
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@ -4,7 +4,7 @@ SWI-Prolog offers a comprehensive free Prolog environment.
## Installation and Setup
Install lanchain-prolog using pip:
Once SWI-Prolog has been installed, install lanchain-prolog using pip:
```bash
pip install langchain-prolog
```