Fix numerous typos in XMLDiffer.py.
Fix numerous typos in XMLDiffer.py.

jhbradley/moose,Chuban/moose,liuwenf/moose,jessecarterMOOSE/moose,andrsd/moose,YaqiWang/moose,SudiptaBiswas/moose,milljm/moose,jasondhales/moose,YaqiWang/moose,liuwenf/moose,Chuban/moose,idaholab/moose,lindsayad/moose,idaholab/moose,joshua-cogliati-inl/moose,andrsd/moose,dschwen/moose,YaqiWang/moose,yipenggao/moose,lindsayad/moose,nuclear-wizard/moose,liuwenf/moose,jasondhales/moose,friedmud/moose,katyhuff/moose,yipenggao/moose,backmari/moose,jessecarterMOOSE/moose,katyhuff/moose,harterj/moose,SudiptaBiswas/moose,lindsayad/moose,sapitts/moose,backmari/moose,idaholab/moose,stimpsonsg/moose,andrsd/moose,dschwen/moose,stimpsonsg/moose,sapitts/moose,bwspenc/moose,permcody/moose,dschwen/moose,milljm/moose,sapitts/moose,laagesen/moose,yipenggao/moose,permcody/moose,bwspenc/moose,Chuban/moose,sapitts/moose,dschwen/moose,joshua-cogliati-inl/moose,jessecarterMOOSE/moose,harterj/moose,jhbradley/moose,idaholab/moose,YaqiWang/moose,backmari/moose,andrsd/moose,milljm/moose,joshua-cogliati-inl/moose,Chuban/moose,harterj/moose,SudiptaBiswas/moose,stimpsonsg/moose,jasondhales/moose,friedmud/moose,laagesen/moose,katyhuff/moose,permcody/moose,jasondhales/moose,jhbradley/moose,stimpsonsg/moose,joshua-cogliati-inl/moose,liuwenf/moose,jessecarterMOOSE/moose,backmari/moose,SudiptaBiswas/moose,harterj/moose,liuwenf/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,katyhuff/moose,milljm/moose,bwspenc/moose,laagesen/moose,nuclear-wizard/moose,sapitts/moose,jhbradley/moose,bwspenc/moose,SudiptaBiswas/moose,lindsayad/moose,friedmud/moose,friedmud/moose,milljm/moose,bwspenc/moose,lindsayad/moose,laagesen/moose,idaholab/moose,liuwenf/moose,laagesen/moose,andrsd/moose,dschwen/moose,permcody/moose,yipenggao/moose,harterj/moose,nuclear-wizard/moose