misc. trivial typos

Decided to quickly run `codespell` on the repo.

assembly.py

@@ -566,7 +566,7 @@ class AsmElementLink(AsmBase):
 
         AsmElementLink links to elements of a constraint. It always link to an
         AsmElement object belonging to the same parent assembly. AsmElement is
-        also a link, which links to an arbitarily nested part object. This
+        also a link, which links to an arbitrarily nested part object. This
         function is for resolving the AsmElementLink's subname reference to the
         actual part object subname reference relative to the parent assembly's
         part group
@@ -1448,7 +1448,7 @@ class AsmMovingPart(object):
             fixed = self.fixedTransform
             movement = self.draggerPlacement.inverse().multiply(pla)
             if not fixed.Shape:
-                # The moving part has completly fixed placement, so we move the
+                # The moving part has completely fixed placement, so we move the
                 # parent assembly instead
                 pla = obj.Placement.multiply(movement)
                 setPlacement(obj,pla,self.undos,self._undoName)

solver.py

@@ -108,7 +108,7 @@ class Solver(object):
         # info.Part may be a link to that object. We use info.Object as a key so
         # that multiple info.Part can share the same entity map.
         #
-        # TODO: It is actually more complicated than that. Becuase info.Object
+        # TODO: It is actually more complicated than that. Because info.Object
         # itself may be a link, and followed by a chain of multiple links. It's
         # complicated because each link can either have a linked placement or
         # not, depends on its LinkTransform property, meaning that their

utils.py

@@ -346,7 +346,7 @@ def fit_rotation_axis_to_surface1( surface, n_u=3, n_v=3 ):
         for j in range(i+1,len(N)):
             # based on the distance_between_axes( p1, u1, p2, u2) function,
             if 1 - abs(np.dot( N[i], N[j])) < 10**-6:
-                continue #ignore parrallel case
+                continue #ignore parallel case
             p1_x, p1_y, p1_z = P[i]
             u1_x, u1_y, u1_z = N[i]
             p2_x, p2_y, p2_z = P[j]
@@ -385,7 +385,7 @@ def fit_rotation_axis_to_surface1( surface, n_u=3, n_v=3 ):
         _U,s,V = np.linalg.svd(A)
         axis_pos = centroid
         axis_dir = V[0]
-        error = s[1] #dont know if this will work
+        error = s[1] #don't know if this will work
         return axis_dir, axis_pos, error
 
 _tol = 10e-7