Fix outdated security documentation

[colinpalmer]

The security documentation at https://jupyter-server.readthedocs.io/en/latest/operators/security.html is out of date.

It has a section that describes an additional one-time token used for browser launch, but this behaviour was replaced by a redirect file a few years ago in jupyter/notebook#4260.

Please could the docs be updated to describe the current implementation? Thanks!

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[krassowski]

Good point! Would you like to open a PR?

[colinpalmer]

I can do, yes. I'm busy just now but maybe in a couple of weeks?