DOC divergences; update notebook formatting

[reshamas]

References

• Towards Update example notebooks for better rendering #394
• References pymc-devs/pymc #5460 (Update example gallery style and formatting)
• References Project Board: https://github.com/pymc-devs/pymc-examples/projects/1

• Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• PR description contains a link to the relevant issue: a tracker one for existing notebooks or a proposal one for new notebooks
• Check the notebook is not excluded from any pre-commit check: https://github.com/pymc-devs/pymc-examples/blob/main/.pre-commit-config.yaml

Helpful links

• https://github.com/pymc-devs/pymc-examples/blob/main/CONTRIBUTING.md

Notes for the Reviewer

• I was not sure who the original author was.
• I added one tag "hierarchical". I was not sure what other tags to add.

#DataUmbrellaPyMCSprint

cc: @symeneses

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[reshamas]

Would you like to review this notebook, @OriolAbril @aloctavodia ?

[reshamas]

mistake here when I merged branches. I am closing this PR.