Update documentation/package-documentation-best-practices.md

Co-authored-by: Pamphile Roy <[email protected]>

Author: lwasser

documentation/package-documentation-best-practices.md

@@ -154,7 +154,7 @@ def extent_to_json(ext_obj):
 
     Parameters
     ----------
-    ext_obj: list or geopandas.GeoDataFrame
+    ext_obj : list or geopandas.GeoDataFrame
         If provided with a geopandas.GeoDataFrame, the extent
         will be generated from that. Otherwise, extent values
         should be in the order: minx, miny, maxx, maxy.