docs fix

docs/docs/tutorials/tot/tot.ipynb

@@ -272,7 +272,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -280,7 +280,7 @@
     "from typing import Optional, Dict, Any\n",
     "from typing_extensions import Annotated, TypedDict\n",
     "from langgraph.graph import StateGraph\n",
-    "from langgraph.types import Runtime\n",
+    "from langgraph.runtime import Runtime\n",
     "\n",
     "from langgraph.checkpoint.memory import InMemorySaver\n",
     "from langgraph.types import Send\n",