Outdated documentation for Jupyter visualization

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [x] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

I would like to visualize point clouds in jupyter notebook. I checked the [documentation](http://www.open3d.org/docs/latest/tutorial/Basic/jupyter.html) and tried to import `JViualizer` but got the error:
`ImportError: cannot import name 'JVisualizer' from 'open3d' (/home/gavin/miniconda3/envs/pgo/lib/python3.9/site-packages/open3d/__init__.py)`

Then, I tried to follow the example in this [documentation page](http://www.open3d.org/docs/release/tutorial/visualization/web_visualizer.html#:~:text=run%20the%20example%20notebook) but didn't find `jupyter_visualization.ipynb` in `examples/python/visualization`.

I'm wondering which is the correct approach to visualizing point clouds in jupyter notebook.

My python version is 3.9 and open3d version is 0.15.2