Reiterate the benefits of collaboration

### How could the content be improved?

Reiterate the benefits of collaboration as an introduction to the lesson on collaboration before diving into managing issues on GitHub. Check Malvika's blog: https://www.software.ac.uk/blog/ten-arguments-against-open-science-you-can-win - many things from there would apply here.

### Which part of the content does your suggestion apply to?

https://carpentries.github.io/lesson-development-training/collaborating-team.html

Start with the collaboration lesson at https://carpentries.github.io/lesson-development-training/collaborating-team.html and review the linked arguments against open science. Add an introductory explanation of collaboration's benefits before the section on managing issues on GitHub. Done means the lesson clearly establishes those benefits before moving into issue management.

Written by the indexing model from the issue text.