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.

Inizia dalla pagina Using issue tracker all’indirizzo devguide.python.org/tracker/ e dalla sezione Fields in the issue tracker della pagina sul triage. Esamina come i contributor trovano attualmente le issue e decidi dove collocare le spiegazioni dei campi. Il lavoro sarà considerato completato quando la guida includerà indicazioni sulla ricerca delle issue rivolte ai contributor e renderà individuabili le informazioni sui campi anche al di fuori del triage.