Update UG with command history tip

AY2122S1-CS2103T-T09-1 / tp

https://ay2122s1-cs2103t-t09-1.github.io/tp/

MIT License

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Closed joenzkc closed 2 years ago

joenzkc commented 2 years ago

UG has no information whatsoever about command history, perhaps can make a tip somewhere to mention it