Command parameter TYPE+INDEX typo

[nus-pe-bot]

Documentation Bug: Under the section for delete command, the parameter given is written in the format "TYPE+INDEX". This may be slightly misleading for users, especially if they think that typing a command like "delete t+1" will work, but simply is not given in the examples.

Edit: This also applies to all other command sections in the user guide that use "TYPE+INDEX"

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_{[original: ang-zeyu/ped#6]}