fix to thermal wind tutorial

Author: Andrew Delman

Intro_to_PO_Tutorials/Thermal_wind.ipynb

@@ -1623,6 +1623,7 @@
    "metadata": {},
    "source": [
     "Comparing the geostrophy and thermal wind normalized differences provides some insight into the challenges of reconstructing velocity fields using thermal wind. Geostrophic balance is a more accurate predictor of velocity than thermal wind, since thermal wind assumes: \n",
+    "\n",
     "* geostrophic balance\n",
     "* hydrostatic balance (not a factor here since hydrostatic balance is actually assumed in the model code itself)\n",
     "* a level of no motion (a potentially more problematic assumption, especially close to $z_0$).\n",