[skip ci] Remove placeholder comments

Author: edoardob90

32_language_modeling_1.ipynb

@@ -192,7 +192,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "#% Student code\n",
     "from collections import defaultdict\n",
     "\n",
     "bigrams = defaultdict(int)\n",
@@ -294,7 +293,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "#% Student code\n",
     "for w in words:\n",
     "  chs = ['.'] + list(w) + ['.']\n",
     "  for ch1, ch2 in zip(chs, chs[1:]):\n",