Fix various typos

Found via codespell.

src/Mod/CAM/CAMTests/TestPathPost.py

@@ -475,7 +475,7 @@ class TestPostProcessorClass(unittest.TestCase):
 #    #
 #    PATHTESTS_LOCATION = "Mod/CAM/CAMTests"
 #    #
-#    # The following code tries to re-use an open FreeCAD document
+#    # The following code tries to reuse an open FreeCAD document
 #    # as much as possible.  It compares the current document with
 #    # the document for the next test.  If the names are different
 #    # then the current document is closed and the new document is

src/Mod/CAM/Path/Op/Drilling.py

@@ -253,7 +253,7 @@ class ObjectDrilling(PathCircularHoleBase.ObjectOp):
         holes = PathUtils.sort_locations(holes, ["x", "y"])
 
         # This section is technical debt. The computation of the
-        # target shapes should be factored out for re-use.
+        # target shapes should be factored out for reuse.
         # This will likely mean refactoring upstream CircularHoleBase to pass
         # spotshapes instead of holes.
 

src/Mod/CAM/Path/Tool/Gui/BitEdit.py

@@ -119,7 +119,7 @@ class ToolBitEditor(object):
         usedRows = 0
         for nr, name in enumerate(tool.Proxy.toolShapeProperties(tool)):
             if nr < len(self.widgets):
-                Path.Log.debug("re-use row: {} [{}]".format(nr, name))
+                Path.Log.debug("reuse row: {} [{}]".format(nr, name))
                 label, qsb, editor = self.widgets[nr]
                 label.setText(labelText(name))
                 editor.attachTo(tool, name)