docs: fix llm/chat_model tables (#15716)

- **Description:** This PR aims to fix the documentation for
langchain-commnuity.

- **Issue:** The table In this page :
[https://python.langchain.com/docs/integrations/llms/](https://urldefense.com/v3/__https://python.langchain.com/docs/integrations/llms/__;!!ACWV5N9M2RV99hQ!Jqw8gWnQrL1H6blPiGN10jrh1TDAzqGcKAaTAZv7TBy1X_m-03E7T-alOrWY5_71R8QUdONvF2wMRK54D50$)
is built based on old module. The proposed fix is to modify the import
from langchain-commnuity.
  
  - **Dependencies:** N/A
  - **Twitter handle:** N/A

docs/scripts/model_feat_table.py

@@ -1,7 +1,7 @@
 import os
 from pathlib import Path
 
-from langchain import chat_models, llms
+from langchain_community import chat_models, llms
 from langchain_core.language_models.chat_models import BaseChatModel, SimpleChatModel
 from langchain_core.language_models.llms import LLM, BaseLLM