Updated 3 survival notebooks to v5

[fonnesbeck]

Updates to 3 notebooks, added headers, footers and info.

To make the merge process smoother we've provided some links and a checklist below.

We understand that PRs can sometimes be overwhelming, especially as the reviews start coming in. Please let us know if the reviews are unclear or the recommended next step seems overly demanding, if you would like help in addressing a reviewer's comments, or if you have been waiting too long to hear back on your PR. -->

• [x] Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• [x] PR description contains a link to the relevant issue:
  • closes https://github.com/pymc-devs/pymc-examples/issues/129
  • closes https://github.com/pymc-devs/pymc-examples/issues/128
• [x] 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

[review-notebook-app[bot]]

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