Links are broken in Notebooks documentation

[throwable-one]

In this document https://jupyterlab.readthedocs.io/en/stable/extension/notebook.html
almost all links like NotebookModel and https://jupyterlab.readthedocs.io/en/stable/api/classes/cells.cellmodel-1.html point to 404

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[krassowski]

Closing as I checked that all the links in https://jupyterlab.readthedocs.io/en/stable/extension/notebook.html and all of these work ok; please reopen if there is a broken link I missed.