Fix formatting in gpt-5 CFG cookbook (#2145)

Author: by-openai

examples/gpt-5/gpt-5_new_params_and_tools.ipynb

@@ -968,16 +968,18 @@
     "| Rules (lower)    | Combine terminals; cannot influence how text is tokenised.                   |\n",
     "| Greedy lexer     | Never try to “shape” free text across multiple terminals – you’ll lose control. |\n",
     "\n",
-    "** Correct vs Incorrect Pattern Design\n",
+    "**Correct vs Incorrect Pattern Design** \n",
     "\n",
     "✅ **One bounded terminal handles free‑text between anchors**  \n",
-    "start: SENTENCE  \n",
-    "SENTENCE: /[A-Za-z, ]*(the hero|a dragon)[A-Za-z, ]*(fought|saved)[A-Za-z, ]*(a treasure|the kingdom)[A-Za-z, ]*\\./  \n",
-    "\n",
+    "```\n",
+    "start: SENTENCE\n",
+    "SENTENCE: /[A-Za-z, ]*(the hero|a dragon)[A-Za-z, ]*(fought|saved)[A-Za-z, ]*(a treasure|the kingdom)[A-Za-z, ]*\\./\n",
+    "```\n",
     "❌ **Don’t split free‑text across multiple terminals/rules**  \n",
-    "start: sentence  \n",
-    "sentence: /[A-Za-z, ]+/ subject /[A-Za-z, ]+/ verb /[A-Za-z, ]+/ object /[A-Za-z, ]+/  \n",
-    "\n",
+    "```\n",
+    "start: sentence\n",
+    "sentence: /[A-Za-z, ]+/ subject /[A-Za-z, ]+/ verb /[A-Za-z, ]+/ object /[A-Za-z, ]+/\n",
+    "```\n",
     "\n",
     "### 3.3 Example - SQL Dialect — MS SQL vs PostgreSQL\n",
     "\n",