Update openPMD-viewer documentation (ECP-WarpX#4682)

Docs/source/dataanalysis/openpmdviewer.rst

@@ -27,13 +27,7 @@ Usage
 -----
 
 openPMD-viewer can be used either in simple Python scripts or in `Jupyter <https://jupyter.org>`__.
-For interactive plots in Jupyter notebook, add this `"cell magic" <https://ipython.readthedocs.io/en/stable/interactive/magics.html>`__ to the first line of your notebook:
-
-.. code-block:: python
-
-   %matplotlib notebook
-
-and for Jupyter Lab use this instead:
+For interactive plots in Jupyter notebook or Jupyter Lab, add this `"cell magic" <https://ipython.readthedocs.io/en/stable/interactive/magics.html>`__ to the first line of your notebook:
 
 .. code-block:: python