update agents.md h1

Author: nm-openai

examples/gpt-5/gpt-5-1-codex-max_prompting_guide.ipynb

@@ -163,7 +163,7 @@
     "\n",
     "The Codex model family uses reasoning summaries to communicate user updates as it’s working. This can be in the form of one-liner headings (which updates the ephemeral text in Codex-CLI), or both heading and a short body. This is done by a separate model and therefore is **not promptable**, and we advise against adding any instructions to the prompt related to intermediate plans or messages to the user. We’ve improved these summaries for Codex-Max to be more communicative and provide more critical information about what’s happening and why; some of our users are updating their UX to promote these summaries more prominently in their UI, similar to how intermediate messages are displayed for GPT-5 series models.\n",
     "\n",
-    "## [Agents.md](http://Agents.md) Usage\n",
+    "## Agents.md Usage\n",
     "\n",
     "Codex-cli automatically enumerates these files and injects them into the conversation; the model has been trained to closely adhere to these instructions.\n",
     "\n",