Fix typos and misc. formatting [skip ci]

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

@@ -1768,7 +1768,7 @@ TopoDS_Shape Area::getShape(int index) {
 
     FC_TIME_INIT(t);
 
-    // do offset first, then pocket the inner most offsetted shape
+    // do offset first, then pocket the inner most offset shape
     std::list<shared_ptr<CArea> > areas;
     makeOffset(areas,PARAM_FIELDS(AREA_MY,AREA_PARAMS_OFFSET));
 

src/Mod/Path/App/Area.h

@@ -145,7 +145,7 @@ protected:
     /** Called internally to obtain the combined children shapes */
     TopoDS_Shape toShape(CArea &area, short fill, int reorient=0);
 
-    /** Obtain a list of offsetted areas
+    /** Obtain a list of offset areas
      *
      * See #AREA_PARAMS_OFFSET for description of the arguments.
      */