docs: clarify build_model docstring in ModelBuilder example

[souro26]

This PR addresses #812 by correcting the docstring of build_model in the
ModelBuilder example notebook.

Specifically, it removes the incorrect reference to model_config as a
function parameter and clarifies that model configuration is accessed via
self.model_config, which is provided by the base ModelBuilder class.

No runtime or behavioral changes are introduced. The notebook was run
end-to-end on a fresh kernel after the update.

Closes #812

• 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 (tracker issues have the "tracker id" label)
  • 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

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