Fix test docs

[cristiano-belloni]

• Separate CLI options from "escape hatches"
• Make it clear that we accept Jest CLI options
• Add --debug option documentation (which diverges from Jest's own --debug)

[changeset-bot]

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Latest commit: 1484a20

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[coveralls]

Coverage decreased (-0.05%) to 33.178% when pulling 1484a20 on feature/fix-test-docs into 00ac6bc on main.