Update source collection slug/URL input label.

app.py

@@ -62,7 +62,8 @@ You can then edit the collection to your liking!</p>"""
     with gr.Column():
         gr.Markdown("## Source Collection")
         source_slug = gr.Textbox(
-            label="Source Collection Slug", placeholder="e.g. username/collection-slug"
+            label="Source Collection slug or URL",
+            placeholder="e.g. username/collection-slug",
         )
         gr.Markdown("## Destination Collection info")
         dest_namespace = gr.Textbox(