document the 'update:true' thing (SOFTWARE-4183)
document the 'update:true' thing (SOFTWARE-4183)

matyasselmeci/htcondor-ce,opensciencegrid/htcondor-ce,matyasselmeci/htcondor-ce,opensciencegrid/htcondor-ce,brianhlin/htcondor-ce,opensciencegrid/htcondor-ce,brianhlin/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce