Doc: fix formatting

[dweindl]

Fix list formatting in doc/example/model_evidence_and_bayes_factors.ipynb, get rid of ipywidgets warning, and fix typo.

https://pypesto.readthedocs.io/en/develop/example/model_evidence_and_bayes_factors.html

/home/docs/checkouts/readthedocs.org/user_builds/pypesto/envs/develop/lib/python3.11/site-packages/rich/live.py:231
: UserWarning: install "ipywidgets" for Jupyter support
  warnings.warn('install "ipywidgets" for Jupyter support')

👀 https://pypesto--1456.org.readthedocs.build/en/1456/example/model_evidence_and_bayes_factors.html#Bayes-Factor

[codecov-commenter]

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All modified and coverable lines are covered by tests ✅

Project coverage is 83.41%. Comparing base (fd652e8) to head (7c72852).

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1456      +/-   ##
===========================================
- Coverage    83.43%   83.41%   -0.02%     
===========================================
  Files          160      160              
  Lines        13473    13473              
===========================================
- Hits         11241    11239       -2     
- Misses        2232     2234       +2     

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[arrjon]

Thanks!