Task: improve the "Using issue tracker" section

The Using issue tracker page seems to describe how to use issue tracker for people who want to report a bug and how to help triage issue.

Seeing this is the developer's guide (aka contributing to Python guide), it would be great if there are sections dedicated for how to search for issues to start contributing.
Even the section about what each fields in the issue tracker mean, perhaps it can be moved outside of the "triaging" section. Those info are useful for general contributors too, not just for triagers. A first time contributor might decide to skip that section entirely, because they don't have triage role, and therefore missing out important information.

Commencez par la page Using issue tracker à l’adresse devguide.python.org/tracker/ et par la section Fields in the issue tracker de la page consacrée au triage. Examinez la manière dont les contributeurs trouvent actuellement les issues et déterminez où les explications des champs doivent être placées. Le travail sera considéré comme terminé lorsque le guide inclura des indications destinées aux contributeurs sur la recherche d’issues et que les informations sur les champs seront accessibles en dehors du triage.