fix (#2049)

Author: CorwinCheung

examples/gpt-5/prompt-optimization-cookbook.ipynb

@@ -254,7 +254,7 @@
    "id": "56da7b3f",
    "metadata": {},
    "source": [
-    "Now let's use the prompt optimization tool in the console to improve our prompt and then review the results. We can start by going to the [OpenAI Optimize Playground](#https://platform.openai.com/chat/edit?optimize=true), and pasting our existing prompt in the Developer Message section.\n",
+    "Now let's use the prompt optimization tool in the console to improve our prompt and then review the results. We can start by going to the [OpenAI Optimize Playground](https://platform.openai.com/chat/edit?optimize=true), and pasting our existing prompt in the Developer Message section.\n",
     "\n",
     "From there press the **Optimize** button. This will open the optimization panel. At this stage, you can either provide specific edits you'd like to see reflected in the prompt or simply press **Optimize** to have it refined according to best practices for the target model and task. To start let's do just this.\n",
     "\n",