Fix solution comment

(cherry picked from commit cdb8e8040129b4c8ab5c3607997b50086fe7cdf1)

Author: ma595

worked-solutions/01_penguin_classification_solutions.ipynb

@@ -810,7 +810,7 @@
     "          and to instead use the stats it has built up from the training set.\n",
     "          The model should not \"remember\" anything from the validation set.\n",
     "    - We also protect this function with ``torch.no_grad()``, because having\n",
-    "      gradients enable while validating is a pointless waste of\n",
+    "      gradients enabled while validating is a pointless waste of\n",
     "      resources — they are only needed for training.\n",
     "\n",
     "    \"\"\"\n",