Inconsistent Invalid Command Prompt Error Message

[Nigeltzy]

Unlike the other commands, when an invalid or incomplete form of the delete command is inputted, there is no suggested remedy or indication of the correct format. While not necessary or application-breaking, it could perhaps be a nice-to-have? Otherwise, the user will have to refer back to the user guide every time they forget the command format for delete.

This is in contrast to a command like add where the error message shown may be much more helpful.