style: more work for refs (#33508)

Largely:
- Remove explicit `"Default is x"` since new refs show default inferred
from sig
- Inline code (useful for eventual parsing)
- Fix code block rendering (indentations)

libs/partners/mistralai/langchain_mistralai/chat_models.py

@@ -1133,7 +1133,7 @@ class ChatMistralAI(BaseChatModel):
 
     @classmethod
     def get_lc_namespace(cls) -> list[str]:
-        """Get the namespace of the langchain object."""
+        """Get the namespace of the LangChain object."""
         return ["langchain", "chat_models", "mistralai"]