gh-36856: various details in modules folder (ruff, cython-lint, roles)
This is fixing various little details in the `modules` folders,
including some suggestions from `ruff` and `cython-lint`.
### :memo: Checklist
- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
URL: https://github.com/sagemath/sage/pull/36856
Reported by: Frédéric Chapoton
Reviewer(s): Matthias Köppe
