chore: update placeholder text

demo.py

@@ -102,7 +102,9 @@ def bot_streaming(message, history, max_new_tokens=512):
 demo = gr.ChatInterface(
     fn=bot_streaming,
     title="Typhoon 2 Vision",
-    textbox=gr.MultimodalTextbox(),
+    textbox=gr.MultimodalTextbox(
+        placeholder="Type a message or drag and drop an image",
+    ),
     additional_inputs=[
         gr.Slider(
             minimum=512,