typo fix, thanks to 姚瑶瑶

Author: johnowhitaker

unit1/02_diffusion_models_from_scratch.ipynb

@@ -650,7 +650,7 @@
     "net = BasicUNet()\n",
     "net.to(device)\n",
     "\n",
-    "# Our loss finction\n",
+    "# Our loss function\n",
     "loss_fn = nn.MSELoss()\n",
     "\n",
     "# The optimizer\n",