updating final review questions

lectures/notes/final-exam-review-guiding-question.ipynb

@@ -791,7 +791,7 @@
     "    - Per user average\n",
     "    - Per item average\n",
     "- Evaluation of recommender systems\n",
-    "- Compare and contrast KNN Imputer, collaborative filtering, and content-based filtering \n",
+    "- Compare and contrast KNN Imputer and content-based filtering \n",
     "- Ethical issues associated with recommender systems "
    ]
   },