Corrected spelling mistake

Mr. Wayne left a note with his training program for the week. I came up with a recipe for dinner left in a note. You can find the document HERE. Download it and save it in the local folder.

unit2/langgraph/agent.ipynb

@@ -331,7 +331,7 @@
    "metadata": {},
    "source": [
     "## Training program\n",
-    "MR Wayne left a note with his training program for the week. I came up with a recipe for dinner leaft in a note.\n",
+    "MR Wayne left a note with his training program for the week. I came up with a recipe for dinner left in a note.\n",
     "\n",
     "you can find the document [HERE](https://huggingface.co/datasets/agents-course/course-images/blob/main/en/unit2/LangGraph/Batman_training_and_meals.png), so download it and upload it in the local folder.\n",
     "\n",