langchain[patch]: Update doc-string for a method in ConversationBuffe…

…rWindowMemory (langchain-ai#18090)

A minor doc fix stated in langchain-ai#18080

libs/langchain/langchain/memory/buffer_window.py

@@ -21,7 +21,7 @@ def buffer(self) -> Union[str, List[BaseMessage]]:
 
     @property
     def buffer_as_str(self) -> str:
-        """Exposes the buffer as a string in case return_messages is True."""
+        """Exposes the buffer as a string in case return_messages is False."""
         messages = self.chat_memory.messages[-self.k * 2 :] if self.k > 0 else []
         return get_buffer_string(
             messages,