DOC: <Issue related to docs/integrations/llms/llama_cpp.mdx>

[Jacky3003]

Checklist

• I added a very descriptive title to this issue.
• I included a link to the documentation page I am referring to (if applicable).

Issue with current documentation:

With the new update to node-llama-cpp being bumped up to version 3, the integration docs for its coresponding LLM component in LangChain should use some updates in the numbering and model being used in the examples in order to avoid confusion. The following docs as a result should be updated:

• https://js.langchain.com/docs/integrations/llms/llama_cpp/#guide-to-installing-llama2
• https://js.langchain.com/docs/integrations/chat/llama_cpp/
• https://js.langchain.com/docs/integrations/text_embedding/llama_cpp/

Idea or request for content:

It would be nice for the version numbering to be changed from 2 to 3. For the LLM's documentation specifically, it should be investigated if the guide to installing a llama 2 model (which should now be llama 3 in this instance) should be updated as well. I plan to work on this issue.