add clarifying comments on color legend

data/data-pipeline/data_pipeline/ipython/hud_eda_se_12_11_2011_relative_differences_between_methodologies.ipynb

@@ -798,6 +798,13 @@
     "sns.histplot(housingburden[\"absolute_difference\"])"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Below are KDE plots of the respective densities. Green is the current methodology; red represnts the revision."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 44,