Improve the 'Testing levels' documentation
What does this MR do?
This tries to address https://gitlab.com/gitlab-org/quality/team-tasks/issues/24 by (hopefully) improving the Testing levels documentation.
What are the relevant issue numbers?
Closes https://gitlab.com/gitlab-org/quality/team-tasks/issues/24.
Does this MR meet the acceptance criteria?
- [-] Changelog entry added, if necessary
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Documentation created/updated - [-] Tests added for this feature/bug
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Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides