update api key comment

app.py

@@ -171,8 +171,8 @@ with gr.Blocks() as demo:
         with gr.Column():
             # Right-1: Openai Api Key Input
             inp_api_key = gr.Textbox(
-                label='OpenAI API Key (this is not stored anywhere)',
-                placeholder='You can generate key at [https://platform.openai.com/api-keys].',
+                label='OpenAI API Key (This will not stored anywhere and you could revoke it after use. Generate new key at [https://platform.openai.com/api-keys].)',
+                placeholder='sk-xxxxxxxxx',
                 lines=1)
             # Right-2: LLM Selection
             llm_dropdown = gr.Dropdown(
@@ -188,7 +188,7 @@ with gr.Blocks() as demo:
             # Right-3: User Instruction Input
             user_instruction_textbox = gr.Textbox(
                 label="Instruction",
-                placeholder="Describe an object in the scene with its attributes and its relation with other objects, e.g. 'The plant between the armchair and the piano.",
+                placeholder="Describe an object in the scene with its attributes and its relation with other objects, e.g. 'The plant between the armchair and the piano.'",
                 # scale=4
             )
             # Right-4: Submit Button