user friendly enhancement

app.py

@@ -302,7 +302,9 @@ with gr.Blocks(css=css) as demo:
         with gr.Row():
             with gr.Column():
                 prompt = gr.Textbox(
-                    label="Text to speech prompt",
+                    label = "Text to speech prompt",
+                    info = "One or two sentences at a time is better*",
+                    placeholder = "Hello friend! How are you today?",
                     elem_id = "tts-prompt"
                 )