Fix filenames in examples/README.md

Author: maksgraczyk

examples/README.md

@@ -1,7 +1,7 @@
 ## Joey examples
 In this directory, you can find Jupyter notebooks with explained step-by-step examples of using Joey. The recommended order of going through them is as follows:
-1. `lenet_forward.ipynb`
-2. `lenet_backward.ipynb`
+1. `lenet_forward_pass.ipynb`
+2. `lenet_backward_pass.ipynb`
 3. `lenet_training.ipynb`
 
 Enjoy!