Header update - check_tr_dup

[sarabodach]

Update header to reflect variables in function for check_tr_dup-

#'
#' @param TR TR dataframe with variables USUBJID, TRLINKID, TRTESTCD, TRCAT, TRSTRESC,
#'           TRSTRESU, VISITDY, TRDTC

But TRLINKID or TRLNKID needed, TRSPID and TREVAL are optional, and VISITDY not used