Side quest idea: patching modules

While the Hello nf-core training provides an excellent introduction to working with modules, I think it would be highly valuable to include a brief side quest covering how to patch a module. Most developers will eventually need to make small custom modifications, and demonstrating the correct patching workflow (to avoid linting failures) would be extremely helpful.

This addition could be a short demo using nf-core modules patch that highlights how modules remain fully modular even after applying custom changes. A simple example (such as the label modification shown in the patch documentation: https://nf-co.re/docs/nf-core-tools/modules/patch) could be sufficient but this can certainly be extended as well.

Start with the Hello nf-core training material and review the nf-core modules patch documentation linked in the issue. Add a brief side quest using nf-core modules patch, with a simple label-modification example and guidance on avoiding linting failures. Done means learners can follow the workflow and understand that patched modules remain modular.