Incomplete section on expected outcome for error in DG pg 29

[nus-pe-bot]

Please refer to screenshot for missing expected outcome. This might be important for developer who are onboarding to know.

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_{[original: nus-cs2113-AY2223S1/pe-interim#697] [original labels: type.DocumentationBug severity.Medium]}

[Than-Duc-Huy]

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