Remove unused import and tweak a comment

examples/foundational/14s-function-calling-direct.py

@@ -10,7 +10,6 @@ import os
 from dotenv import load_dotenv
 from loguru import logger
 
-from pipecat.adapters.schemas.function_schema import FunctionSchema
 from pipecat.adapters.schemas.tools_schema import ToolsSchema
 from pipecat.audio.vad.silero import SileroVADAnalyzer
 from pipecat.frames.frames import TTSSpeakFrame

src/pipecat/adapters/schemas/direct_function.py

@@ -217,6 +217,7 @@ class DirectFunctionWrapper(BaseDirectFunctionWrapper):
     Wrapper around a DirectFunction that:
     - extracts metadata from the function signature and docstring
     - generates a corresponding FunctionSchema
+    - helps with function invocation
     """
 
     @classmethod