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/Gui/ViewProviderPyImp.cpp

@@ -456,7 +456,7 @@ PyObject* ViewProviderPy::setElementColors(PyObject* args)
     for(auto it=dict.begin();it!=dict.end();++it) {
         const auto &value = *it;
         if(!value.first.isString() || !value.second.isSequence())
-            throw Py::TypeError("Expect the dictonary contain items of type elementName:(r,g,b,a)");
+            throw Py::TypeError("Expect the dictionary to contain items of type elementName:(r,g,b,a)");
 
         App::PropertyColor prop;
         prop.setPyObject(value.second.ptr());