[CI] Improve Docs CI Efficiency (#3587)

Co-authored-by: zhaochenyang20 <zhaochen20@outlook.com>

docs/backend/offline_engine_api.ipynb

@@ -40,6 +40,11 @@
     "from sglang.utils import stream_and_merge, async_stream_and_merge\n",
     "import sglang as sgl\n",
     "import asyncio\n",
+    "from sglang.test.test_utils import is_in_ci\n",
+    "\n",
+    "if is_in_ci():\n",
+    "    import patch\n",
+    "\n",
     "\n",
     "llm = sgl.Engine(model_path=\"meta-llama/Meta-Llama-3.1-8B-Instruct\")"
    ]
@@ -201,8 +206,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import sglang as sgl\n",
-    "\n",
     "llm = sgl.Engine(\n",
     "    model_path=\"meta-llama/Meta-Llama-3.1-8B-Instruct\", return_hidden_states=True\n",
     ")"