DOC: Update a link in tutorials.rst
DOC: Update a link in tutorials.rst

Statistical Data Analysis in Python, tutorial by Christopher Fonnesbeck from SciPy 2013

New link: https://github.com/fonnesbeck/statistical-analysis-python-tutorial

The old link does not work.
https://conference.scipy.org/scipy2013/tutorial_detail.php?id=109

- [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Thanks @star1327p 