Update comments

Author: srbalakr

notebooks/chat-read-retrieve-read.ipynb

@@ -22,6 +22,10 @@
     "AZURE_OPENAI_CHATGPT_DEPLOYMENT = os.environ.get(\"AZURE_OPENAI_CHATGPT_DEPLOYMENT\") or \"chat\"\n",
     "AZURE_OPENAI_CHATGPT_MODEL = os.environ.get(\"AZURE_OPENAI_CHATGPT_MODEL\") or \"gpt-35-turbo\"\n",
     "\n",
+    "KB_FIELDS_CONTENT = os.environ.get(\"KB_FIELDS_CONTENT\") or \"content\"\n",
+    "KB_FIELDS_CATEGORY = os.environ.get(\"KB_FIELDS_CATEGORY\") or \"category\"\n",
+    "KB_FIELDS_SOURCEPAGE = os.environ.get(\"KB_FIELDS_SOURCEPAGE\") or \"sourcepage\"\n",
+    "\n",
     "# Use the current user identity to authenticate with Azure OpenAI, Cognitive Search and Blob Storage (no secrets needed, \n",
     "# just use 'az login' locally, and managed identity when deployed on Azure). If you need to use keys, use separate AzureKeyCredential instances with the \n",
     "# keys for each service\n",