Jupyter kernel picker docs are out of date

Testing https://github.com/microsoft/vscode-jupyter/issues/13765

In product:

![image](https://github.com/microsoft/vscode-docs/assets/2193314/ccf0ac78-49c5-41fb-a9b0-94a8fdd18921)

vs:

https://code.visualstudio.com/docs/datascience/jupyter-kernel-management#_existing-jupyter-server
![image](https://github.com/microsoft/vscode-docs/assets/2193314/b4888a88-8abf-4b6f-97e1-9bba8c108944)
