Fix description of callpeak on replicates. '-t' and '-c'.
Fix description of callpeak on replicates. '-t' and '-c'.

daler/MACS,vd4mmind/MACS,taoliu/MACS,taoliu/MACS,vd4mmind/MACS,daler/MACS,daler/MACS,taoliu/MACS,vd4mmind/MACS