Editing to existing person example not stated in UG

[Emberlynn-Loo]

Expected To be stated as either an example or a warning that a user cannot edit a contact to the same name as another contact that already exists.

Actual Missing example or warning, leading for users to believe that they can do so and getting confused when they are unable to do so when they try it.

[nus-se-script]

Your response not required for this bug as the team has accepted the bug as it is.