`alt` seems to be used incorrectly in `next` command sequence diagram

[nus-se-script]

Note from the teaching team: This bug was reported during the Part II (Evaluating Documents) stage of the PE. You may reject this bug if it is not related to the quality of documentation.

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alt block here seems like its functioning as an opt instead.

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_{[original: nus-cs2113-AY2324S2/pe-interim#2382] [original labels: severity.Low type.DocumentationBug]}

[Leong-ZM]

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