Fix documentation problems

Author: hansthen

docs/advanced_guide/polygons_from_list_of_points.md

@@ -263,6 +263,4 @@ my_map_global
 
 * https://docs.scipy.org/doc/scipy-0.19.0/reference/generated/scipy.spatial.ConvexHull.html, accessed 29.12.2018
 
-* https://medium.com/@vworri/simple-geospacial-mapping-with-geopandas-and-the-usual-suspects-77f46d40e807, accessed 29.12.2018
-
 * https://web.archive.org/web/20191207074940/http://blog.thehumangeo.com/2014/05/12/drawing-boundaries-in-python/, accessed 04.01.2019

folium/plugins/groupedlayercontrol.py

@@ -13,11 +13,12 @@ class GroupedLayerControl(JSCSSMixin, MacroElement):
     ----------
     groups : dict
         A dictionary where the keys are group names and the values are lists
-        of layer objects.
-        e.g. {
+        of layer objects. E.g.
+        {
             "Group 1": [layer1, layer2],
             "Group 2": [layer3, layer4]
         }
+
     exclusive_groups: bool, default True
         Whether to use radio buttons (default) or checkboxes.
         If you want to use both, use two separate instances of this class.