Update agentchat_nestedchat_optiguide.ipynb (#2122)

auxillary -> auxiliary

Author: eltociear

notebook/agentchat_nestedchat_optiguide.ipynb

@@ -46,7 +46,7 @@
     "from termcolor import colored\n",
     "from autogen.code_utils import extract_code\n",
     "\n",
-    "# import auxillary packages\n",
+    "# import auxiliary packages\n",
     "import requests  # for loading the example source code\n",
     "\n",
     "config_list_gpt4 = autogen.config_list_from_json(\n",