Fix placeholder and value bug

app.py

@@ -56,7 +56,10 @@ with gr.Blocks() as demo:
     gr.Markdown("# 🦄 Try GPT-1 and GPT-2")
     with gr.Row():
         with gr.Column(scale=4):
-            inp = gr.Textbox(label="Input text:", placeholder=SAMPLE_INPUT, lines=10,)
+            inp = gr.Textbox(label="Input text:",
+                             placeholder="Enter some text to get started.",
+                             value=SAMPLE_INPUT,
+                             lines=10)
             out = gr.Textbox(label="Generated text:", lines=25)
         with gr.Column(scale=1):
             with gr.Row(scale=1):