Mention ne_10m_land in split_to_tiles.sql.
Mention ne_10m_land in split_to_tiles.sql.

data/split_to_tiles.sql
	-Describe why the file is useful/how we used it to carve up the
	`ne_10m_land` dataset, for posterity.

mapzen/vector-datasource,adncentral/vector-datasource,zoondka/vector-datasource,adncentral/vector-datasource,zoondka/vector-datasource,gronke/vector-datasource,mapzen/vector-datasource,adncentral/vector-datasource,kyroskoh/vector-datasource,gronke/vector-datasource,kyroskoh/vector-datasource,mapzen/vector-datasource,adncentral/vector-datasource