Update documentation to remove obsolete references (#1116)

All the examples were deleted from the repo as part of issue #712

docs/source/tutorials/pipe.rst

@@ -76,5 +76,3 @@ Finally, to run the model and compute the loss function, make sure that outputs
     optimizer.step()
 
 
-
-You can find a complete example under the `examples folder <https://github.com/facebookresearch/fairscale/blob/main/examples/tutorial_pipe.py>`_ in the fairscale repo.