small edit to notebook 4

Author: Mark Bauer

4-geospatial-data-mapping.ipynb

@@ -49,15 +49,15 @@
     "       * 9.5 Graduated Symbol Map\n",
     "       * 9.6 Voroni Map\n",
     "       * 9.7 Quadtree Map\n",
-    "   10. Relationship Tests\n",
-    "   11. Set Operations with Overlay\n",
+    "   10. Relationship Tests  \n",
+    "   11. Set Operations with Overlay  \n",
     "       * 11.1 Union\n",
     "       * 11.2 Intersection\n",
     "       * 11.3 Symmetric Difference\n",
     "       * 11.4 Difference\n",
     "       * 11.5 Identity\n",
     "       * 11.6 Aggregation with Dissolve\n",
-    "   12. Additional Attributes and Methods\n",
+    "   12. Additional Attributes and Methods  \n",
     "       * 12.1 Unary Predicates\n",
     "       * 12.2 Binary Predicates\n",
     "           * 12.2.1 Centroids vs. Representative Points\n",