typos

README.md

@@ -48,17 +48,17 @@ See [cad/assembly/elements/](/cad/assembly/elements) for kinematic elements, and
 
 Motor and XY Constraint:
 
-![motor](/images/kunits-motor.png)
+![motor](/images/kunit-motor.png)
 
 XY Constraints, with preload adjusting and without:
 
-![xy-adjust](/images/kunits-xy-adjust.png)
+![xy-adjust](/images/kunit-xy-adjust.png)
 
-![xy](/images/kunits-xy.png)
+![xy](/images/kunit-xy.png)
 
 YZ Constraints ('out of plane'):
 
-![yz](/images/kunits-zy.png)
+![yz](/images/kunit-zy.png)
 
 **Assembling in Rhino**