Fix various (doxy) typos and whitespace issues

Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,ba,beginn,behaviour,bloaded,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childs,colour,colours,commen,currenty,dof,doubleclick,dum,eiter,elemente,feld,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,orgin,orginx,orginy,ot,pard,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,uint,unter,vertexes,wallthickness,whitespaces -S ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml`

src/Mod/PartDesign/Gui/ReferenceSelection.cpp

@@ -212,7 +212,7 @@ void getReferencedSelection(const App::DocumentObject* thisObj, const Gui::Selec
     
     //check if the selection is an external reference and ask the user what to do
     //of course only if thisObj is in a body, as otherwise the old workflow would not 
-    //be supportet
+    //be supported
     PartDesign::Body* body = PartDesignGui::getBodyFor(thisObj, false);
     bool originfeature = selObj->isDerivedFrom(App::OriginFeature::getClassTypeId());
     if (!originfeature && body) {