Correct etldoc mapping.

layers/boundary/boundary.sql

@@ -116,7 +116,7 @@ CREATE OR REPLACE VIEW boundary_z12 AS (
     FROM osm_border_linestring_gen2
 );
 
--- etldoc: osm_border_linestring_gen1 -> boundary_z12
+-- etldoc: osm_border_linestring_gen1 -> boundary_z13
 CREATE OR REPLACE VIEW boundary_z13 AS (
     SELECT geometry, admin_level, disputed, maritime
     FROM osm_border_linestring_gen1
@@ -167,4 +167,4 @@ RETURNS TABLE(geometry geometry, admin_level int, disputed int, maritime int) AS
         -- etldoc: boundary_z13 -> layer_boundary:z13
         SELECT * FROM boundary_z13 WHERE geometry && bbox AND zoom_level >= 13
     ) AS zoom_levels;
-$$ LANGUAGE SQL IMMUTABLE;
+$$ LANGUAGE SQL IMMUTABLE;