Update description

app.py

@@ -102,7 +102,7 @@ def main():
         fn=generate_lego,
         title='LegoGPT Demo',
         description='Official demo for [LegoGPT](https://avalovelace1.github.io/LegoGPT/), the first approach for generating physically stable LEGO brick models from text prompts.\n\n'
-                    'The model is restricted to creating structures on a 20x20x20 grid. It was trained on a dataset of 21 object categories: '
+                    'The model is restricted to creating structures made of 1-unit-tall cuboid bricks on a 20x20x20 grid. It was trained on a dataset of 21 object categories: '
                     '*basket, bed, bench, birdhouse, bookshelf, bottle, bowl, bus, camera, car, chair, guitar, jar, mug, piano, pot, sofa, table, tower, train, vessel.* '
                     'Performance on prompts from outside these categories may be limited. This demo does not include texturing or coloring.',
         inputs=[in_prompt],