Fixed minor typo in Readme.md and demo.py

Readme.md

@@ -87,7 +87,7 @@ You can download our trained models [here](https://github.com/yewzijian/RegTR/re
 We provide a simple demo script `demo.py` that loads our model and checkpoints, registers 2 point clouds, and visualizes the result. Simply download the pretrained models and run the following from the `src/` directory:
 
 ```bash
-python demo.py --example 0  # choose from 0 - 6 (see code for details)
+python demo.py --example 0  # choose from 0 - 4 (see code for details)
 ```
 
 Press 'q' to end the visualization and exit. Refer the documentation for `visualize_result()` for explanation of the visualization.

src/demo.py

@@ -50,7 +50,7 @@
 
 parser = argparse.ArgumentParser()
 parser.add_argument('--example', type=int, default=0,
-                    help=f'Example pair to run (between 0 and {len(_examples) - 1}')
+                    help=f'Example pair to run (between 0 and {len(_examples) - 1})')
 parser.add_argument('--threshold', type=float, default=0.5,
                     help='Controls viusalization of keypoints outside overlap region.')
 opt = parser.parse_args()