Fix typos [skip ci]

Found via `codespell v2.1.dev0`  
```
codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,apoints,ba,beginn,behaviour,bloaded,byteorder,calculater,cancelled,cancelling,cas,cascade,click,dum,eiter,elemente,ende,feld,finde,findf,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,ist,kilometre,lod,mantatory,methode,metres,millim,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,./ChangeLogpios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml
```

src/Mod/Sketcher/App/planegcs/GCS.cpp

@@ -3880,7 +3880,7 @@ SolverReportingManager::Manager().LogToFile("GCS::System::diagnose()\n");
 
     makeReducedJacobian(J, jacobianconstraintmap, pdiagnoselist, tagmultiplicity);
 
-    // this function will exit with a diagnosis and, unless overriden by functions below, with full DoFs
+    // this function will exit with a diagnosis and, unless overridden by functions below, with full DoFs
     hasDiagnosis = true;
     dofs = pdiagnoselist.size();