Update app.py

app.py

@@ -11,10 +11,8 @@ with gr.Blocks(theme='gradio/default') as demo:
         with gr.Column(scale=10):
             gr.Markdown(
                 """
-                # Theme preview: `Default`
-                To use this theme, set `theme='gradio/default'` in `gr.Blocks()` or `gr.Interface()`.
-                You can append an `@` and a semantic version expression, e.g. @>=1.0.0,<2.0.0 to pin to a given version
-                of this theme.
+                # Theme preview: `a11y-one`
+                To use this theme, set `theme='Tonic/a11y-one'` in `gr.Blocks()` or `gr.Interface()`.
                 """
             )
         with gr.Column(scale=3):