Fix typos and whitespace

Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,anormal,apoints,ba,beginn,behaviour,bloaded,bottome,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childrens,childs,colour,colours,commen,connexion,currenty,dof,doubleclick,dum,eiter,elemente,ende,feld,finde,findf,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,inout,ist,itsel,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oce,oder,ontop,orgin,orginx,orginy,ot,pard,parm,parms,pres,programm,que,rady,recurrance,ro,rougly,seperator,serie,sinc,siz,strack,substraction,te,technic,thist,thru,tread,uint,unter,uptodate,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/Base/StackWalker.cpp,./build/doc/SourceDocu`

src/Mod/TechDraw/App/Geometry.cpp

@@ -587,7 +587,7 @@ void BaseGeom::intersectionLL(TechDraw::BaseGeomPtr geom1,
     // Taken from: <http://de.wikipedia.org/wiki/Schnittpunkt>
     TechDraw::GenericPtr gen1 = std::static_pointer_cast<TechDraw::Generic>(geom1);
     TechDraw::GenericPtr gen2 = std::static_pointer_cast<TechDraw::Generic>(geom2);
-    // we calculate vectors to start points and direction verctors
+    // we calculate vectors to start points and direction vectors
     Base::Vector3d startPnt1 = gen1->points.at(0);
     Base::Vector3d endPnt1 = gen1->points.at(1);
     Base::Vector3d startPnt2 = gen2->points.at(0);