fix type Intantiate -> Instantiate

Author: IgorDzreyev

chapters/chapter_3/3_5_Classifying_Yelp_Review_Sentiment.ipynb

@@ -234,7 +234,7 @@
     "\n",
     "    @classmethod\n",
     "    def from_serializable(cls, contents):\n",
-    "        \"\"\"Intantiate a ReviewVectorizer from a serializable dictionary\n",
+    "        \"\"\"Instantiate a ReviewVectorizer from a serializable dictionary\n",
     "        \n",
     "        Args:\n",
     "            contents (dict): the serializable dictionary\n",