Minor nitpick, the UG states Parameters can be in any order., and since indexes are also parameters (Words in UPPER_CASE are the parameters to be supplied by the user.), it would mean that a command like edit n/John INDEX should be allowed, even though should not be (limitations of parser). I think that you could have perhaps made it explict that index parameters should not be reordered.
Minor nitpick, the UG states
Parameters can be in any order., and since indexes are also parameters (Words in UPPER_CASE are the parameters to be supplied by the user.), it would mean that a command likeedit n/John INDEXshould be allowed, even though should not be (limitations of parser). I think that you could have perhaps made it explict that index parameters should not be reordered.