added clearer descriptions

app.py

@@ -21,10 +21,12 @@ with st.form("request_form"):
         label="Model name",
         value="gpt2",
         help=f"The name of the model to use."
+             f"Supported models are all the models in:"
+             f" https://huggingface.co/models?pipeline_tag=text-generation&library=pytorch",
     )
 
     output_length: int = st.number_input(
-        label="Output Length in tokens",
+        label="Number of word pieces in the generated text, 1-4096 (default: 100)",
         min_value=1,
         max_value=4096,
         value=100,