Write that if there are more admin users the list is comma delimited.
Write if rom user1, user2 is allowed (notice the space after the comma) or if only user1,user2 is allowed
Maybe put multiple-user example into the example
Write that if admin users occurs in [global] sections whether these user may administrate all shares and whether these users may administrate the whole samba if the samba is configured as a PDC.
i've updated the example, but I think the description is ok as it is.