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/Path/App/Area.cpp

@@ -883,8 +883,8 @@ struct WireJoiner {
                     if(vit->pt().SquareDistance(pt[i]) > tol)
                         break;
                     auto &vinfo = *vit;
-                    // yse, we push ourself, too, because other edges require
-                    // this info in the adjcent list. We'll do filtering later.
+                    // yes, we push ourself too, because other edges require
+                    // this info in the adjacent list. We'll do filtering later.
                     adjacentList.push_back(vinfo);
                     ++info.iEnd[i];
                 }
@@ -3416,4 +3416,3 @@ void Area::setDefaultParams(const AreaStaticParams &params){
 const AreaStaticParams &Area::getDefaultParams() {
     return s_params;
 }
-