refactor: update app.py to fix button label and improve descriptions

app.py

@@ -220,7 +220,7 @@ with gr.Blocks() as demo:
 
     corpus_preview_df = gr.DataFrame(label="Dataset Preview")
     preview_summary = gr.Markdown()
-    gr.Markdown("""### 4. Upload to Hub
+    gr.Markdown("""### 4. Upload to the Hub
     After adjusting parameters and previewing the dataset, you can upload it to the Hugging Face Hub. Make sure to sign in to your Hugging Face account. Specify the Hub ID and choose whether to make the dataset private. Click 'Upload to Hub' to complete the process.
     """)
     with gr.Row():
@@ -229,7 +229,7 @@ with gr.Blocks() as demo:
             hub_id = gr.Textbox(value=None, label="Hub ID")
             private = gr.Checkbox(False, label="Upload dataset to a private repo?")
 
-    upload_hub_button = gr.Button("Upload to Hub")
+    upload_hub_button = gr.Button("Upload to the Hub")
     upload_summary = gr.Markdown()
 
     with gr.Accordion("detailed logs", open=False):