add note for MacOS

Author: jiannanWang

beginner_source/blitz/cifar10_tutorial.py

@@ -65,7 +65,8 @@
 
 ########################################################################
 # .. note::
-#     If running on Windows and you get a BrokenPipeError, try setting
+#     If you are running this tutorial on Windows or MacOS and encounter a 
+#     BrokenPipeError or RuntimeError related to multiprocessing, try setting
 #     the num_worker of torch.utils.data.DataLoader() to 0.
 
 transform = transforms.Compose(