porous_flow/doc/config.yml changed by hand to include rdg.  Fixes #12346
porous_flow/doc/config.yml changed by hand to include rdg.  Fixes #12346

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