Change kernel filters to reflect image and Colab

The kernel filters should be 5x5 as opposed to 3x3 as that is what is depicted in the image and what it done within the Google Colab.

Author: xksteven

beginner_source/blitz/neural_networks_tutorial.py

@@ -46,10 +46,10 @@ class Net(nn.Module):
 
     def __init__(self):
         super(Net, self).__init__()
-        # 1 input image channel, 6 output channels, 3x3 square convolution
+        # 1 input image channel, 6 output channels, 5x5 square convolution
         # kernel
-        self.conv1 = nn.Conv2d(1, 6, 3)
-        self.conv2 = nn.Conv2d(6, 16, 3)
+        self.conv1 = nn.Conv2d(1, 6, 5)
+        self.conv2 = nn.Conv2d(6, 16, 5)
         # an affine operation: y = Wx + b
         self.fc1 = nn.Linear(16 * 6 * 6, 120)  # 6*6 from image dimension 
         self.fc2 = nn.Linear(120, 84)