Fix volume_threshold severity example and document warn/error behavior

[joostboon]

Summary

• Remove misleading config.severity: error from the custom thresholds example (it overrides the built-in dual severity)
• Add "How severity levels work" section explaining that the test already uses warn_if/error_if internally
• Add <Warning> callout about not setting config.severity on this test

The test macro configures warn_if='>=1', error_if='>=2' internally, so dbt automatically warns at warn_threshold_percent and errors at error_threshold_percent. Setting config.severity: error overrides this and turns all warnings into errors.

Test plan

• Verify page renders correctly with the new Warning callout

🤖 Generated with Claude Code

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