Update app.py

app.py

@@ -2,7 +2,7 @@ import os
 import openai
 import gradio as gr
 
-# Retrieve and verify the OpenAI API key from the environment variable
+# Retrieve and verify the OpenAI API key from the environment variable.
 api_key = os.getenv('OPENAI_API_KEY')
 if not api_key:
     raise ValueError("OpenAI API key not found. Please set it in the environment variables.")