Updates IP addresses geocoder docs

geocoder/ip-addresses/sql/build_data_table.sql

@@ -1,9 +1,8 @@
 
 ---- IP addresses table ---
---- ---
 
 -- Clear table
-
 DELETE FROM ip_address_locations;
+-- Updates table with new source data
 INSERT INTO ip_address_locations (the_geom, network_start_ip) SELECT the_geom, network_start_ip::inet FROM latest_ip_address_locations;
 DROP TABLE latest_ip_address_locations;