Warning for delete command

[nus-pe-bot]

UserGuide should warn the user that the question number might change after a delete command.

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_{[original: nus-cs2113-AY2324S1/pe-interim#1040] [original labels: severity.Medium type.DocumentationBug]}

[James-Hong-Jey]

Team's Response

It is a reasonable assumption for the user to assume that questions will have uninterrupted indexes from 1 to *, rather than having a list that is 3., 7. etc. after deletions

Duplicate status (if any):

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