Fix typos

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,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/Path/PathScripts/PathUtil.py

@@ -64,7 +64,7 @@ def getProperty(obj, prop):
     return attr
 
 def getPropertyValueString(obj, prop):
-    '''getPropertyValueString(obj, prop) ... answer a string represntation of an object's property's value.'''
+    '''getPropertyValueString(obj, prop) ... answer a string representation of an object's property's value.'''
     attr = getProperty(obj, prop)
     if hasattr(attr, 'UserString'):
         return attr.UserString

src/Mod/Path/PathScripts/PathUtils.py

@@ -21,7 +21,7 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
-'''PathUtils -common functions used in PathScripts for filterig, sorting, and generating gcode toolpath data '''
+'''PathUtils -common functions used in PathScripts for filtering, sorting, and generating gcode toolpath data '''
 import FreeCAD
 import Part
 import Path