Modify lessons sequence diagram has incomplete activation bars

[nus-pe-bot]

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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In ModuleServiceController, there is no arrow to signify the start of the activation bar.

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_{[original: nus-cs2113-AY2324S1/pe-interim#236] [original labels: severity.Low type.DocumentationBug]}

[rohitcube]

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