Fix link and add non-Docker commands to testing page in the docs

[pamelafox]

Description

The current coverage link is a 404 so I updated it to point to latest, similar to the pytest link. I also put the non-Docker version of commands first, to mirror what's done earlier in the article.

Checklist:

• I've made sure that tests are updated accordingly (especially if adding or updating a template option)
• I've updated the documentation or confirm that my change doesn't require any updates

Rationale

Main motivation is fixing the 404.

[browniebroke]

Thanks!