Update Gradio component from Textbox to Slider in the slider2 input example.

run.py

@@ -3,7 +3,7 @@ import gradio as gr
 with gr.Blocks() as demo:
     with gr.Row():
         text1 = gr.Textbox(label="t1")
-        slider2 = gr.Textbox(label="s2")
+        slider2 = gr.Slider(label="s2")
         drop3 = gr.Dropdown(["a", "b", "c"], label="d3")
     with gr.Row():
         with gr.Column(scale=1, min_width=600):