fix: wrong description

app.py

@@ -132,7 +132,7 @@ def demo():
                     )
                     copyright_tags = gr.Textbox(
                         label="Copyright tags",
-                        placeholder="You can specify copyright tags manually. e.g.) hatsune miku",
+                        placeholder="You can specify copyright tags manually. This must be valid danbooru tags. e.g.) vocaloid, blue archive",
                     )
                     length = gr.Dropdown(
                         label="Length",