adds comment for openai package

examples/Search_augmented_by_query_generation_and_embeddings_reranking.ipynb

@@ -62,7 +62,7 @@
     "from IPython import display  # for pretty printing\n",
     "import json  # for parsing the JSON api responses and model outputs\n",
     "from numpy import dot  # for cosine similarity\n",
-    "import openai\n",
+    "import openai  # for using GPT and getting embeddings\n",
     "import os  # for loading environment variables\n",
     "import requests  # for making the API requests\n",
     "from tqdm import tqdm  # for printing progress bars\n",