Docs: Fix ValueError in tutorial by adding default value to MoneyModel

[pragam-m25]

Description

Problem:
The MoneyModel class defined in the "Introductory Tutorial" (0_first_model.ipynb) does not specify default values for its __init__ parameters (e.g., def __init__(self, n, seed=None):).

This does not cause an error when running the tutorial notebook itself (as it calls MoneyModel(10)), which is why the ReadTheDocs CI passes.

However, it throws a ValueError: Missing required model parameter: "n" when this MoneyModel class is used with ModelPage (Solara), as Solara's visualization components require default values to build the UI. This error is reported in issue #2535.

Solution:
This PR adds a default value (n=10) to all three instances of the MoneyModel's __init__ method in the tutorial, fixing the crash when used with Solara.

Related Issue

Closes #2535
(This bug was not caught by CI, which is tracked in #2734)

Checklist

• I have read and agree to the Code of Conduct.
• I have read the contributing guidelines.
• I have added tests for my changes. (Not applicable, docs change)
• I have updated the documentation if necessary.
• All tests pass. (Not applicable, docs change)
• My code follows the code style of this project.

[tpike3]

LGTM! Thanks @pragam-m25;

I went backwards and looked at the PR and then the issue.
I will let @EwoutH weigh in.

Right now my view is if this prevents a reoccurring issue with our dependencies then there is no harm in updating the tutorial with a default value, particularly the initial tutorial.

[pragam-m25]

Hi @tpike3, thanks for the review and the approval! I'm glad this helps.

[EwoutH]

Sorry totally forgot, this is good to go. Thanks @pragam-m25!

[pragam-m25]

No problem at all! Thanks for all your help and for getting it merged, @EwoutH!