MNT: make black to notebook example

Author: Lucas-Prates

docs/notebooks/monte_carlo_analysis/monte_carlo_class_usage.ipynb

@@ -1149,6 +1149,7 @@
    "source": [
     "import numpy as np\n",
     "\n",
+    "\n",
     "def custom_export_function(flight):\n",
     "    reynold_number_list = flight.reynolds_number(flight.time)\n",
     "    average_reynolds_number = np.mean(reynold_number_list)\n",