Documentation: Strengthen warning about import * usage in modules tutorial

[yusuaois]

Documentation

In Doc/tutorial/modules.rst, the current wording about import * usage is not sufficiently strong:

- "However, it is okay to use it to save typing in interactive sessions."

This phrasing has two main issues:

- Understates risks: Framing it as "okay" minimizes the potential problems with wildcard imports

- Incomplete guidance: Fails to explicitly warn against using this pattern in production code

- Ambiguous justification: "Save typing" implies convenience is the primary consideration, ignoring namespace pollution risks