Update wiki about local LLM to use updated langchain-community.llms

[PiotrEsse]

Small update, just not to forget. As for incoming changes with langchain it would be nice to update doc and code to reflect changes.
Change where -

• Old code: from langchain.llms import Ollama
• New code: from langchain_community.llms import Ollama

error message:

LangChainDeprecationWarning: Importing LLMs 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.llms import Ollama`.

To install langchain-community run `pip install -U langchain-community`.
  warnings.warn(

[reaperkrew]

Hi @PiotrEsse I have created #180 to address this issue