Update Peacock instructions
Update Peacock instructions

refs #13279

laagesen/moose,lindsayad/moose,bwspenc/moose,milljm/moose,andrsd/moose,idaholab/moose,andrsd/moose,laagesen/moose,milljm/moose,SudiptaBiswas/moose,permcody/moose,nuclear-wizard/moose,permcody/moose,andrsd/moose,jessecarterMOOSE/moose,YaqiWang/moose,harterj/moose,SudiptaBiswas/moose,SudiptaBiswas/moose,idaholab/moose,milljm/moose,bwspenc/moose,lindsayad/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,harterj/moose,YaqiWang/moose,sapitts/moose,idaholab/moose,bwspenc/moose,bwspenc/moose,bwspenc/moose,sapitts/moose,milljm/moose,YaqiWang/moose,nuclear-wizard/moose,harterj/moose,milljm/moose,jessecarterMOOSE/moose,lindsayad/moose,permcody/moose,dschwen/moose,laagesen/moose,lindsayad/moose,sapitts/moose,harterj/moose,andrsd/moose,dschwen/moose,idaholab/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,YaqiWang/moose,andrsd/moose,laagesen/moose,dschwen/moose,dschwen/moose,sapitts/moose,harterj/moose,nuclear-wizard/moose,idaholab/moose,dschwen/moose,jessecarterMOOSE/moose,lindsayad/moose,permcody/moose,laagesen/moose,SudiptaBiswas/moose,sapitts/moose