ollama: add pydocstyle linting for ollama (#27686)

Description: add lint docstrings for ollama module
Issue: the issue https://github.com/langchain-ai/langchain/issues/23188
@baskaryan

test: ruff check passed.
<img width="311" alt="e94c68ffa93dd518297a95a93de5217"
src="https://github.com/user-attachments/assets/e96bf721-e0e3-44de-a50e-206603de398e">

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/ollama/langchain_ollama/__init__.py

@@ -1,3 +1,9 @@
+"""This is the langchain_ollama package.
+
+It provides infrastructure for interacting with the Ollama service.
+"""
+
+
 from importlib import metadata
 
 from langchain_ollama.chat_models import ChatOllama

libs/partners/ollama/langchain_ollama/chat_models.py

@@ -90,7 +90,7 @@ def _lc_tool_call_to_openai_tool_call(tool_call: ToolCall) -> dict:
 
 
 class ChatOllama(BaseChatModel):
-    """Ollama chat model integration.
+    r"""Ollama chat model integration.
 
     .. dropdown:: Setup
         :open:

libs/partners/ollama/langchain_ollama/embeddings.py

@@ -1,3 +1,4 @@
+"""Ollama embeddings models."""
 from typing import (
     List,
     Optional,