corrected typo

Author: billchen-openai

examples/responses_api/reasoning_items.ipynb

@@ -6,9 +6,17 @@
    "source": [
     "## Better performance from reasoning models using the Responses API \n",
     "\n",
-    "Overview: By leveraging the Responses API with OpenAI’s latest reasoning models, you can unlock higher intelligence, lower costs, and more efficient token usage in your applications. The API also enables access to reasoning summaries, supports features like hosted-tool use, and is designed to accommodate upcoming enhancements for even greater flexibility and performance.\n",
+    "### Overview\n",
     "\n",
-    "We've recently released two new state-of-the-art reasoning models, o3 and o4-mini, that excel at combining reasoning capabilities with agentic tool use. What many folks don't know is that you can improve their performance by fully leveraging our (relatively) new Responses API. This cookbook shows how to get the most out of these models and explores how reasoning and function calling work behind the scenes. By giving the model access to previous reasoning items, we can ensure it operates at maximum intelligence and lowest cost.\n"
+    "By leveraging the Responses API with OpenAI’s latest reasoning models, you can unlock higher intelligence, lower costs, and more efficient token usage in your applications. The API also enables access to reasoning summaries, supports features like hosted-tool use, and is designed to accommodate upcoming enhancements for even greater flexibility and performance.\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "\n",
+    "We've recently released two new state-of-the-art reasoning models, o3 and o4-mini, that excel at combining reasoning capabilities with agentic tool use. What many folks don't know is that you can improve their performance by fully leveraging our (relatively) new Responses API. This cookbook shows how to get the most out of these models and explores how reasoning and function calling work behind the scenes. By giving the model access to previous reasoning items, we can ensure it operates at maximum intelligence and lowest cost."
    ]
   },
   {
@@ -41,7 +49,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Let use examine the response object returned "
+    "Let us examine the response object being returned:"
    ]
   },
   {