Fix typos [skip-ci]

Found via codespell v1.18.0.dev0  
```
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,connexion,currenty,dof,doubleclick,dum,eiter,elemente,ende,feld,finde,findf,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/Draft/draftmake/make_dimension.py

@@ -101,7 +101,7 @@ def make_dimension(p1, p2, p3=None, p4=None):
         p3 = p4
         if not p3:
             # When used from the GUI command, this will never run
-            # because p4 will always be assinged to a vector,
+            # because p4 will always be assigned to a vector,
             # so p3 will never be `None`.
             # Moreover, `new_obj.Base` doesn't exist, and certainly `Shape`
             # doesn't exist, so if this ever runs it will be an error.
@@ -522,7 +522,7 @@ def make_angular_dimension(center=App.Vector(0, 0, 0),
     angles: list of two floats, optional
         It defaults to `[0, 90]`.
         It is a list of two angles, given in degrees, that determine
-        the apperture of the dimension line, that is, of the circular arc.
+        the aperture of the dimension line, that is, of the circular arc.
         It is drawn counter-clockwise.
         ::
             angles = [0 90]