Describe the bug
Documentation link in the tutorials section points to a URL that returns a 404 page.

Expected behavior
The link should point to the correct "Collecting Data" tutorials page.

To Reproduce

1. Visit https://mesa.readthedocs.io/latest/tutorials/2_collecting_data_tutorial.html
2. This link should return a 404 page.

Additional context
I think the correct target is:
https://mesa.readthedocs.io/latest/tutorials/2_collecting_data.html

I have prepared a PR with the proposed fix, but I wanted to confirm that this is the correct replacement

PR: #2973