PR Summary

I was having some trouble building docs locally due to some bad interaction between
the ipython sphinx directive and running in a virtual environment (despite ipython being installed in the environment)

Rather than spending a large amount of time figuring out how to resolve those incompatibilities, I just removed
the directive that was causing the problem and replaced it with code-block which is what we use everywhere else (that isn't a plot) anyway.

PR Checklist

Documentation and Tests

• [N/A] Has pytest style unit tests (and pytest passes)
• Documentation is sphinx and numpydoc compliant (the docs should build without error).
• [N/A] New plotting related features are documented with examples.

Release Notes

• [N/A] New features are marked with a .. versionadded:: directive in the docstring and documented in doc/users/next_whats_new/
• [N/A] API changes are marked with a .. versionchanged:: directive in the docstring and documented in doc/api/next_api_changes/
• [N/A] Release notes conform with instructions in next_whats_new/README.rst or next_api_changes/README.rst