Update per review

Co-authored-by: Aurélien FOUCRET <[email protected]>

notebooks/search/08-learning-to-rank.ipynb

@@ -1155,7 +1155,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "We can see that the `title` and `popularity` fields are critical to our model's ranking feature. Now all results include the query terms in the title. Moreover, more popular movies rank higher, for example `Star Wars: Episode I - The Phantom Menace` is now in third position."
+We can see that the `title_bm25` and `popularity` features are weighted more importantly in our trained model.  Now all results include the query terms in the title, outlining the importance of the `title_bm25` feature in the model. Similarly, more popular movies now rank higher, for example `Star Wars: Episode I - The Phantom Menace` is now in third position.
    ]
   }
  ],