cifar10 tutorial: Fix grammatical error (pytorch#721)

Co-authored-by: holly1238 <[email protected]>

Author: rht

beginner_source/blitz/cifar10_tutorial.py

@@ -43,15 +43,15 @@
 
 We will do the following steps in order:
 
-1. Load and normalizing the CIFAR10 training and test datasets using
+1. Load and normalize the CIFAR10 training and test datasets using
    ``torchvision``
 2. Define a Convolutional Neural Network
 3. Define a loss function
 4. Train the network on the training data
 5. Test the network on the test data
 
-1. Loading and normalizing CIFAR10
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+1. Load and normalize CIFAR10
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Using ``torchvision``, it’s extremely easy to load CIFAR10.
 """