fix typo (#2195)

Author: carter-oai

examples/building_w_rt_mini/building_w_rt_mini.ipynb

@@ -24,7 +24,7 @@
     "## System Architecture\n",
     "For our application today we are going to be building an extremely simple customer support app using the **“handoff architecture”**. **“Handoff Architecture”** means a **primary agent** acts as the orchestrator for all incoming customer queries. Rather than handling every request directly, the primary agent analyzes the intent behind the user’s message and **categorizes it into one of 2 core pathways**:\n",
     "\n",
-    "1. General questions and basic support (no authenticatior required).\n",
+    "1. General questions and basic support (no authenticator required).\n",
     "2. Specific questions (user authentication required before lookup is performed).\n",
     "\n",
     "Based on this categorization, the primary agent **hands off the conversation** to the appropriate specialist agent designed for that specific task.\n",