docs: aws docs updates (#20571)

libs/community/langchain_community/chat_models/bedrock.py

@@ -2,6 +2,7 @@ import re
 from collections import defaultdict
 from typing import Any, Dict, Iterator, List, Optional, Tuple, Union
 
+from langchain_core._api.deprecation import deprecated
 from langchain_core.callbacks import (
     CallbackManagerForLLMRun,
 )
@@ -195,6 +196,9 @@ class ChatPromptAdapter:
 _message_type_lookups = {"human": "user", "ai": "assistant"}
 
 
+@deprecated(
+    since="0.0.34", removal="0.3", alternative_import="langchain_aws.ChatBedrock"
+)
 class BedrockChat(BaseChatModel, BedrockBase):
     """Chat model that uses the Bedrock API."""